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class="w-full pt-6 scrolling-touch lg:h-auto grow pe-0 lg:pe-5 lg:pb-16 md:pt-4 lg:pt-4 scrolling-gpu"><ul><h3 class="mb-1 text-sm font-bold ms-5 text-tertiary dark:text-tertiary-dark">GET STARTED</h3><li><a title="Quick Start" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn"><div>Quick Start </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R8im6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Tutorial: Tic-Tac-Toe" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/tutorial-tic-tac-toe"><div>Tutorial: Tic-Tac-Toe </div></a></li><li><a title="Thinking in React" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/thinking-in-react"><div>Thinking in React </div></a></li></ul></div></div></li><li><a title="Installation" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/installation"><div>Installation </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R8qm6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Start a New React Project" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/start-a-new-react-project"><div>Start a New React Project </div></a></li><li><a title="Add React to an Existing Project" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/add-react-to-an-existing-project"><div>Add React to an Existing Project </div></a></li><li><a title="Editor Setup" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/editor-setup"><div>Editor Setup </div></a></li><li><a title="Using TypeScript" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/typescript"><div>Using TypeScript </div></a></li><li><a title="React Developer Tools" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/react-developer-tools"><div>React Developer Tools </div></a></li><li><a title="React Compiler" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/react-compiler"><div>React Compiler <svg class="ms-2 text-gray-30 dark:text-gray-60 inline-block w-4 h-4 align-[-3px]" width="20px" height="20px" viewBox="0 0 20 20" version="1.1" xmlns="http://www.w3.org/2000/svg"><title> - This feature is available in the 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id="Shape"></path></g></g></svg></div></a></li></ul></div></div></li><li role="separator" class="mt-4 mb-2 ms-5 border-b border-border dark:border-border-dark"></li><h3 class="mb-1 text-sm font-bold ms-5 text-tertiary dark:text-tertiary-dark mt-2">LEARN REACT</h3><li><a title="Describing the UI" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/describing-the-ui"><div>Describing the UI </div><span class="pe-1 text-link dark:text-link-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition rotate-0" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-100" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R9am6:" aria-hidden="false" role="region" style="box-sizing:border-box"><ul><li><a title="Your First Component" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/your-first-component"><div>Your First Component </div></a></li><li><a title="Importing and Exporting Components" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/importing-and-exporting-components"><div>Importing and Exporting Components </div></a></li><li><a title="Writing Markup with JSX" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/writing-markup-with-jsx"><div>Writing Markup with JSX </div></a></li><li><a title="JavaScript in JSX with Curly Braces" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/javascript-in-jsx-with-curly-braces"><div>JavaScript in JSX with Curly Braces </div></a></li><li><a title="Passing Props to a Component" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/passing-props-to-a-component"><div>Passing Props to a Component </div></a></li><li><a title="Conditional Rendering" target="" aria-current="page" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-link dark:text-link-dark bg-highlight dark:bg-highlight-dark border-blue-40 hover:bg-highlight hover:text-link dark:hover:bg-highlight-dark dark:hover:text-link-dark" href="/learn/conditional-rendering"><div>Conditional Rendering </div></a></li><li><a title="Rendering Lists" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/rendering-lists"><div>Rendering Lists </div></a></li><li><a title="Keeping Components Pure" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/keeping-components-pure"><div>Keeping Components Pure </div></a></li><li><a title="Your UI as a Tree" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/understanding-your-ui-as-a-tree"><div>Your UI as a Tree </div></a></li></ul></div></div></li><li><a title="Adding Interactivity" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/adding-interactivity"><div>Adding Interactivity </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R9im6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Responding to Events" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/responding-to-events"><div>Responding to Events </div></a></li><li><a title="State: A Component's Memory" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/state-a-components-memory"><div>State: A Component's Memory </div></a></li><li><a title="Render and Commit" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/render-and-commit"><div>Render and Commit </div></a></li><li><a title="State as a Snapshot" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/state-as-a-snapshot"><div>State as a Snapshot </div></a></li><li><a title="Queueing a Series of State Updates" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/queueing-a-series-of-state-updates"><div>Queueing a Series of State Updates </div></a></li><li><a title="Updating Objects in State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/updating-objects-in-state"><div>Updating Objects in State </div></a></li><li><a title="Updating Arrays in State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/updating-arrays-in-state"><div>Updating Arrays in State </div></a></li></ul></div></div></li><li><a title="Managing State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/managing-state"><div>Managing State </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:R9qm6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Reacting to Input with State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/reacting-to-input-with-state"><div>Reacting to Input with State </div></a></li><li><a title="Choosing the State Structure" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/choosing-the-state-structure"><div>Choosing the State Structure </div></a></li><li><a title="Sharing State Between Components" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/sharing-state-between-components"><div>Sharing State Between Components </div></a></li><li><a title="Preserving and Resetting State" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/preserving-and-resetting-state"><div>Preserving and Resetting State </div></a></li><li><a title="Extracting State Logic into a Reducer" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/extracting-state-logic-into-a-reducer"><div>Extracting State Logic into a Reducer </div></a></li><li><a title="Passing Data Deeply with Context" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/passing-data-deeply-with-context"><div>Passing Data Deeply with Context </div></a></li><li><a title="Scaling Up with Reducer and Context" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/scaling-up-with-reducer-and-context"><div>Scaling Up with Reducer and Context </div></a></li></ul></div></div></li><li><a title="Escape Hatches" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between ps-5 text-base font-bold text-primary dark:text-primary-dark" href="/learn/escape-hatches"><div>Escape Hatches </div><span class="pe-1 text-tertiary dark:text-tertiary-dark"><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" class="duration-100 ease-in transition -rotate-90 rtl:rotate-90" style="min-width:20px;min-height:20px"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span></a><div class="opacity-50" style="transition:opacity 250ms ease-in-out"><div id="react-collapsed-panel-:Ra2m6:" aria-hidden="true" role="region" style="box-sizing:border-box;display:none;height:0px;overflow:hidden"><ul><li><a title="Referencing Values with Refs" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/referencing-values-with-refs"><div>Referencing Values with Refs </div></a></li><li><a title="Manipulating the DOM with Refs" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/manipulating-the-dom-with-refs"><div>Manipulating the DOM with Refs </div></a></li><li><a title="Synchronizing with Effects" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/synchronizing-with-effects"><div>Synchronizing with Effects </div></a></li><li><a title="You Might Not Need an Effect" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/you-might-not-need-an-effect"><div>You Might Not Need an Effect </div></a></li><li><a title="Lifecycle of Reactive Effects" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/lifecycle-of-reactive-effects"><div>Lifecycle of Reactive Effects </div></a></li><li><a title="Separating Events from Effects" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/separating-events-from-effects"><div>Separating Events from Effects </div></a></li><li><a title="Removing Effect Dependencies" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/removing-effect-dependencies"><div>Removing Effect Dependencies </div></a></li><li><a title="Reusing Logic with Custom Hooks" target="" class="p-2 pe-2 w-full rounded-none lg:rounded-e-2xl text-start hover:bg-gray-5 dark:hover:bg-gray-80 relative flex items-center justify-between text-sm ps-6 ps-5 text-base text-secondary dark:text-secondary-dark" href="/learn/reusing-logic-with-custom-hooks"><div>Reusing Logic with Custom Hooks </div></a></li></ul></div></div></li></ul><div class="h-20"></div></nav><div class="fixed bottom-0 hidden lg:block"><div class="max-w-custom-xs w-80 lg:w-auto py-3 shadow-lg rounded-lg m-4 bg-wash dark:bg-gray-95 px-4 flex"><p class="w-full text-lg font-bold text-primary dark:text-primary-dark me-4">Is this page useful?</p><button aria-label="Yes" class="px-3 rounded-lg bg-secondary-button dark:bg-secondary-button-dark text-primary dark:text-primary-dark me-2"><svg width="16" height="18" viewBox="0 0 16 18" fill="none" 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9.42608C8.28237 9.42608 8.54595 9.5701 8.70195 9.80961C8.85794 10.0491 8.88558 10.3523 8.77555 10.6169L7.11114 14.6201C7 14.8875 6.98105 15.1852 7.05738 15.4649C7.1337 15.7446 7.30079 15.9897 7.53147 16.1605L7.62458 16.2294Z" fill="currentColor"></path></svg></button></div></div></aside></div></div></div></div><main class="min-w-0 isolate"><article class="font-normal break-words text-primary dark:text-primary-dark"><div class="ps-0"><div class=""><div class="px-5 sm:px-12 pt-3.5"><div class="max-w-4xl ms-0 2xl:mx-auto"><div class="flex flex-wrap"><div class="flex mb-3 mt-0.5 items-center"><a class="text-link dark:text-link-dark text-sm tracking-wide font-bold uppercase me-1 hover:underline" href="/learn">Learn React</a><span class="inline-block me-1 text-link dark:text-link-dark text-lg rtl:rotate-180"><svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M6.86612 13.6161C6.37796 14.1043 6.37796 14.8957 6.86612 15.3839C7.35427 15.872 8.14572 15.872 8.63388 15.3839L13.1339 10.8839C13.622 10.3957 13.622 9.60428 13.1339 9.11612L8.63388 4.61612C8.14572 4.12797 7.35427 4.12797 6.86612 4.61612C6.37796 5.10428 6.37796 5.89573 6.86612 6.38388L10.4822 10L6.86612 13.6161Z" fill="currentColor"></path></svg></span></div><div class="flex mb-3 mt-0.5 items-center"><a class="text-link dark:text-link-dark text-sm tracking-wide font-bold uppercase me-1 hover:underline" href="/learn/describing-the-ui">Describing the UI</a><span class="inline-block me-1 text-link dark:text-link-dark text-lg rtl:rotate-180"><svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M6.86612 13.6161C6.37796 14.1043 6.37796 14.8957 6.86612 15.3839C7.35427 15.872 8.14572 15.872 8.63388 15.3839L13.1339 10.8839C13.622 10.3957 13.622 9.60428 13.1339 9.11612L8.63388 4.61612C8.14572 4.12797 7.35427 4.12797 6.86612 4.61612C6.37796 5.10428 6.37796 5.89573 6.86612 6.38388L10.4822 10L6.86612 13.6161Z" fill="currentColor"></path></svg></span></div></div><h1 class="mdx-heading mt-0 text-primary dark:text-primary-dark -mx-.5 break-words text-5xl font-display font-bold leading-tight">Conditional Rendering<a href="#undefined" aria-label="Link for this heading" title="Link for this heading" class="mdx-header-anchor hidden"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h1></div></div></div><div class="px-5 sm:px-12"><div class="max-w-7xl mx-auto"><div class="max-w-4xl ms-0 2xl:mx-auto"><div class="font-display text-xl text-primary dark:text-primary-dark leading-relaxed"><p class="whitespace-pre-wrap my-4">Your components will often need to display different things depending on different conditions. In React, you can conditionally render JSX using JavaScript syntax like <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">if</code> statements, <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">&&</code>, and <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">? :</code> operators.</p></div> <div class="p-6 xl:p-8 pb-4 xl:pb-6 bg-card dark:bg-card-dark rounded-2xl shadow-inner-border dark:shadow-inner-border-dark text-base text-secondary dark:text-secondary-dark my-8"><h3 class="mdx-heading text-primary dark:text-primary-dark mt-0 mb-3 leading-tight text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">You will learn</h3><ul class="ms-6 my-3 list-disc"> <li class="leading-relaxed mb-1">How to return different JSX depending on a condition</li> <li class="leading-relaxed mb-1">How to conditionally include or exclude a piece of JSX</li> <li class="leading-relaxed mb-1">Common conditional syntax shortcuts you’ll encounter in React codebases</li> </ul></div> <h2 id="conditionally-returning-jsx" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6">Conditionally returning JSX <a href="#conditionally-returning-jsx" aria-label="Link for Conditionally returning JSX " title="Link for Conditionally returning JSX " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2> <p class="whitespace-pre-wrap my-4">Let’s say you have a <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">PackingList</code> component rendering several <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Item</code>s, which can be marked as packed or not:</p> </div><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border dark:border-border-dark rounded-t-lg text-lg"><div class="flex-1 grow min-w-0 px-4 lg:px-6"><div><div class="relative overflow-hidden"><div class="w-[fit-content] invisible"><div class=" sp-tabs" translate="no"><div aria-label="Select active file" class=" sp-tabs-scrollable-container" role="tablist"><button aria-selected="true" class=" sp-tab-button" data-active="true" role="tab" title="/src/App.js" type="button">App.js</button></div></div></div><button class="absolute top-0 start-[2px]" id="headlessui-listbox-button-:Rj52cq6:" aria-haspopup="true" aria-expanded="false" data-headlessui-state=""><span class="h-full py-2 px-1 mt-px -mb-px flex border-b text-link dark:text-link-dark border-link dark:border-link-dark items-center text-md leading-tight truncate" style="max-width:160px">App.js</span></button></div></div></div><div class="px-3 flex items-center justify-end text-start" translate="yes"><button class="text-sm text-primary dark:text-primary-dark inline-flex items-center hover:text-link duration-100 ease-in transition mx-1" title="Reset Sandbox" type="button"><svg width="1em" height="1em" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="inline mx-1 relative"><path d="M13.8982 5.20844C12.4626 4.88688 10.9686 4.93769 9.55821 5.35604L11.8524 3.06184C11.8989 3.0154 11.9357 2.96028 11.9608 2.89961C11.986 2.83894 11.9989 2.77391 11.9989 2.70824C11.9989 2.64256 11.986 2.57754 11.9608 2.51686C11.9357 2.45619 11.8989 2.40107 11.8524 2.35464L11.1456 1.64784C11.0992 1.60139 11.0441 1.56455 10.9834 1.53942C10.9227 1.51428 10.8577 1.50134 10.792 1.50134C10.7263 1.50134 10.6613 1.51428 10.6006 1.53942C10.54 1.56455 10.4848 1.60139 10.4384 1.64784L6.14571 5.94054C6.00654 6.07969 5.89615 6.2449 5.82083 6.42673C5.74551 6.60855 5.70675 6.80343 5.70675 7.00024C5.70675 7.19704 5.74551 7.39192 5.82083 7.57374C5.89615 7.75557 6.00654 7.92078 6.14571 8.05994L10.4387 12.3529C10.5325 12.4465 10.6595 12.4991 10.792 12.4991C10.9245 12.4991 11.0516 12.4465 11.1453 12.3529L11.8527 11.6455C11.9463 11.5518 11.9989 11.4247 11.9989 11.2922C11.9989 11.1598 11.9463 11.0327 11.8527 10.9389L8.77481 7.86104C9.99795 7.16236 11.415 6.8801 12.8125 7.05678C14.21 7.23347 15.5122 7.85953 16.523 8.84064C17.5338 9.82176 18.1983 11.1048 18.4165 12.4964C18.6347 13.888 18.3947 15.3129 17.7328 16.5562C17.0708 17.7996 16.0227 18.7942 14.7463 19.3902C13.47 19.9861 12.0345 20.1511 10.6563 19.8603C9.27798 19.5695 8.03152 18.8387 7.10469 17.778C6.17786 16.7172 5.62086 15.384 5.51761 13.9791C5.51156 13.8512 5.45689 13.7303 5.36477 13.6413C5.27265 13.5522 5.15001 13.5017 5.02191 13.5H4.02081C3.95297 13.4996 3.88574 13.5129 3.8232 13.5392C3.76065 13.5655 3.70408 13.6042 3.6569 13.6529C3.60972 13.7017 3.57291 13.7595 3.54869 13.8228C3.52448 13.8862 3.51336 13.9538 3.51601 14.0216C3.61349 15.5965 4.1473 17.1132 5.0577 18.4019C5.9681 19.6906 7.21917 20.7006 8.6709 21.3188C10.1226 21.937 11.7178 22.139 13.2778 21.9022C14.8378 21.6654 16.3011 20.9992 17.504 19.978C18.7069 18.9569 19.6019 17.6212 20.0889 16.1203C20.5759 14.6195 20.6356 13.0128 20.2614 11.4799C19.8872 9.94705 19.0938 8.54858 17.97 7.44098C16.8462 6.33339 15.4363 5.56037 13.8982 5.20844V5.20844Z" fill="currentColor"></path></svg> Reset</button><a href="https://codesandbox.io/api/v1/sandboxes/define?undefined&environment=create-react-app" rel="noreferrer noopener" target="_blank" title="Open in CodeSandbox" class="text-sm text-primary dark:text-primary-dark inline-flex items-center hover:text-link duration-100 ease-in transition mx-1 ms-2 md:ms-1"><svg width="1em" height="1em" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="inline mx-1 relative top-[1px]"><path d="M20.5001 2H15.5001C15.3675 2 15.2403 2.05268 15.1465 2.14645C15.0528 2.24021 15.0001 2.36739 15.0001 2.5V3.5C15.0001 3.63261 15.0528 3.75979 15.1465 3.85355C15.2403 3.94732 15.3675 4 15.5001 4H18.5901L7.6501 14.94C7.60323 14.9865 7.56604 15.0418 7.54065 15.1027C7.51527 15.1636 7.5022 15.229 7.5022 15.295C7.5022 15.361 7.51527 15.4264 7.54065 15.4873C7.56604 15.5482 7.60323 15.6035 7.6501 15.65L8.3501 16.35C8.39658 16.3969 8.45188 16.4341 8.51281 16.4594C8.57374 16.4848 8.63909 16.4979 8.7051 16.4979C8.7711 16.4979 8.83646 16.4848 8.89738 16.4594C8.95831 16.4341 9.01362 16.3969 9.0601 16.35L20.0001 5.41V8.5C20.0001 8.63261 20.0528 8.75979 20.1465 8.85355C20.2403 8.94732 20.3675 9 20.5001 9H21.5001C21.6327 9 21.7599 8.94732 21.8537 8.85355C21.9474 8.75979 22.0001 8.63261 22.0001 8.5V3.5C22.0001 3.10218 21.8421 2.72064 21.5608 2.43934C21.2795 2.15804 20.8979 2 20.5001 2V2Z" fill="currentColor"></path><path d="M21.5 13H20.5C20.3674 13 20.2402 13.0527 20.1464 13.1464C20.0527 13.2402 20 13.3674 20 13.5V20H4V4H10.5C10.6326 4 10.7598 3.94732 10.8536 3.85355C10.9473 3.75979 11 3.63261 11 3.5V2.5C11 2.36739 10.9473 2.24021 10.8536 2.14645C10.7598 2.05268 10.6326 2 10.5 2H3.5C3.10218 2 2.72064 2.15804 2.43934 2.43934C2.15804 2.72064 2 3.10218 2 3.5V20.5C2 20.8978 2.15804 21.2794 2.43934 21.5607C2.72064 21.842 3.10218 22 3.5 22H20.5C20.8978 22 21.2794 21.842 21.5607 21.5607C21.842 21.2794 22 20.8978 22 20.5V13.5C22 13.3674 21.9473 13.2402 21.8536 13.1464C21.7598 13.0527 21.6326 13 21.5 13Z" fill="currentColor"></path></svg><span class="hidden md:block">Fork</span></a></div></div><div class=" sp-layout"><div class=" sp-editor sp-stack"><div class=" sp-code-editor"><div aria-autocomplete="list" aria-label="Code Editor for App.js" aria-multiline="true" class="sp-pristine sp-javascript sp-cm" role="textbox" tabindex="0" translate="no"><pre class=" sp-pre-placeholder" style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Item</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-property">name</span><span class="sp-syntax-punctuation">,</span> <span class="sp-syntax-property">isPacked</span> <span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">PackingList</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Sally Ride's Packing List<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Space suit"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Helmet with a golden leaf"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">false</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Photo of Tam"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> </pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 xl:order-last border-b-1 relative top-0"><span class="flex p-2 focus:outline-none text-primary dark:text-primary-dark leading-[20px]"><svg class="rotate-0 inline me-1.5 text-xl" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg>Show more</span></button></div></div></div></div><div class="max-w-4xl ms-0 2xl:mx-auto"> <p class="whitespace-pre-wrap my-4">Notice that some of the <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Item</code> components have their <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked</code> prop set to <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">true</code> instead of <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">false</code>. You want to add a checkmark (✅) to packed items if <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked={true}</code>.</p> <p class="whitespace-pre-wrap my-4">You can write this as an <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/if...else" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal"><code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">if</code>/<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">else</code> statement</a> like so:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br/></div><div class="cm-line "> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span> ✅<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span><br/></div><div class="cm-line "><span class="sp-syntax-punctuation">}</span><br/></div><div class="cm-line "><span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">If the <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked</code> prop is <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">true</code>, this code <strong class="font-bold">returns a different JSX tree.</strong> With this change, some of the items get a checkmark at the end:</p> </div><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border dark:border-border-dark rounded-t-lg text-lg"><div class="flex-1 grow min-w-0 px-4 lg:px-6"><div><div class="relative overflow-hidden"><div class="w-[fit-content] invisible"><div class=" sp-tabs" translate="no"><div aria-label="Select active file" class=" sp-tabs-scrollable-container" role="tablist"><button aria-selected="true" class=" sp-tab-button" data-active="true" 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8.85355C20.2403 8.94732 20.3675 9 20.5001 9H21.5001C21.6327 9 21.7599 8.94732 21.8537 8.85355C21.9474 8.75979 22.0001 8.63261 22.0001 8.5V3.5C22.0001 3.10218 21.8421 2.72064 21.5608 2.43934C21.2795 2.15804 20.8979 2 20.5001 2V2Z" fill="currentColor"></path><path d="M21.5 13H20.5C20.3674 13 20.2402 13.0527 20.1464 13.1464C20.0527 13.2402 20 13.3674 20 13.5V20H4V4H10.5C10.6326 4 10.7598 3.94732 10.8536 3.85355C10.9473 3.75979 11 3.63261 11 3.5V2.5C11 2.36739 10.9473 2.24021 10.8536 2.14645C10.7598 2.05268 10.6326 2 10.5 2H3.5C3.10218 2 2.72064 2.15804 2.43934 2.43934C2.15804 2.72064 2 3.10218 2 3.5V20.5C2 20.8978 2.15804 21.2794 2.43934 21.5607C2.72064 21.842 3.10218 22 3.5 22H20.5C20.8978 22 21.2794 21.842 21.5607 21.5607C21.842 21.2794 22 20.8978 22 20.5V13.5C22 13.3674 21.9473 13.2402 21.8536 13.1464C21.7598 13.0527 21.6326 13 21.5 13Z" fill="currentColor"></path></svg><span class="hidden md:block">Fork</span></a></div></div><div class=" sp-layout"><div class=" sp-editor sp-stack"><div class=" sp-code-editor"><div aria-autocomplete="list" aria-label="Code Editor for App.js" aria-multiline="true" class="sp-pristine sp-javascript sp-cm" role="textbox" tabindex="0" translate="no"><pre class=" sp-pre-placeholder" style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Item</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-property">name</span><span class="sp-syntax-punctuation">,</span> <span class="sp-syntax-property">isPacked</span> <span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span> ✅<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">PackingList</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Sally Ride's Packing List<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Space suit"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Helmet with a golden leaf"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">false</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Photo of Tam"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> </pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 xl:order-last border-b-1 relative top-0"><span class="flex p-2 focus:outline-none text-primary dark:text-primary-dark leading-[20px]"><svg class="rotate-0 inline me-1.5 text-xl" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg>Show more</span></button></div></div></div></div><div class="max-w-4xl ms-0 2xl:mx-auto"> <p class="whitespace-pre-wrap my-4">Try editing what gets returned in either case, and see how the result changes!</p> <p class="whitespace-pre-wrap my-4">Notice how you’re creating branching logic with JavaScript’s <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">if</code> and <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">return</code> statements. In React, control flow (like conditions) is handled by JavaScript.</p> <h3 id="conditionally-returning-nothing-with-null" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">Conditionally returning nothing with <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">null</code> <a href="#conditionally-returning-nothing-with-null" aria-label="Link for this heading" title="Link for this heading" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3> <p class="whitespace-pre-wrap my-4">In some situations, you won’t want to render anything at all. For example, say you don’t want to show packed items at all. A component must return something. In this case, you can return <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">null</code>:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br/></div><div class="cm-line "> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-keyword">null</span><span class="sp-syntax-punctuation">;</span><br/></div><div class="cm-line "><span class="sp-syntax-punctuation">}</span><br/></div><div class="cm-line "><span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">If <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked</code> is true, the component will return nothing, <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">null</code>. Otherwise, it will return JSX to render.</p> </div><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border dark:border-border-dark rounded-t-lg text-lg"><div class="flex-1 grow min-w-0 px-4 lg:px-6"><div><div class="relative overflow-hidden"><div class="w-[fit-content] invisible"><div class=" sp-tabs" translate="no"><div aria-label="Select active file" class=" sp-tabs-scrollable-container" role="tablist"><button aria-selected="true" class=" sp-tab-button" data-active="true" role="tab" title="/src/App.js" type="button">App.js</button></div></div></div><button class="absolute top-0 start-[2px]" id="headlessui-listbox-button-:Rj56cq6:" aria-haspopup="true" aria-expanded="false" data-headlessui-state=""><span class="h-full py-2 px-1 mt-px -mb-px flex border-b text-link 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top-[1px]"><path d="M20.5001 2H15.5001C15.3675 2 15.2403 2.05268 15.1465 2.14645C15.0528 2.24021 15.0001 2.36739 15.0001 2.5V3.5C15.0001 3.63261 15.0528 3.75979 15.1465 3.85355C15.2403 3.94732 15.3675 4 15.5001 4H18.5901L7.6501 14.94C7.60323 14.9865 7.56604 15.0418 7.54065 15.1027C7.51527 15.1636 7.5022 15.229 7.5022 15.295C7.5022 15.361 7.51527 15.4264 7.54065 15.4873C7.56604 15.5482 7.60323 15.6035 7.6501 15.65L8.3501 16.35C8.39658 16.3969 8.45188 16.4341 8.51281 16.4594C8.57374 16.4848 8.63909 16.4979 8.7051 16.4979C8.7711 16.4979 8.83646 16.4848 8.89738 16.4594C8.95831 16.4341 9.01362 16.3969 9.0601 16.35L20.0001 5.41V8.5C20.0001 8.63261 20.0528 8.75979 20.1465 8.85355C20.2403 8.94732 20.3675 9 20.5001 9H21.5001C21.6327 9 21.7599 8.94732 21.8537 8.85355C21.9474 8.75979 22.0001 8.63261 22.0001 8.5V3.5C22.0001 3.10218 21.8421 2.72064 21.5608 2.43934C21.2795 2.15804 20.8979 2 20.5001 2V2Z" fill="currentColor"></path><path d="M21.5 13H20.5C20.3674 13 20.2402 13.0527 20.1464 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class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Item</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-property">name</span><span class="sp-syntax-punctuation">,</span> <span class="sp-syntax-property">isPacked</span> <span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-keyword">null</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">PackingList</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Sally Ride's Packing List<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Space suit"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Helmet with a golden leaf"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">false</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Photo of Tam"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> </pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 xl:order-last border-b-1 relative top-0"><span class="flex p-2 focus:outline-none text-primary dark:text-primary-dark leading-[20px]"><svg class="rotate-0 inline me-1.5 text-xl" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg>Show more</span></button></div></div></div></div><div class="max-w-4xl ms-0 2xl:mx-auto"> <p class="whitespace-pre-wrap my-4">In practice, returning <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">null</code> from a component isn’t common because it might surprise a developer trying to render it. More often, you would conditionally include or exclude the component in the parent component’s JSX. Here’s how to do that!</p> <h2 id="conditionally-including-jsx" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6">Conditionally including JSX <a href="#conditionally-including-jsx" aria-label="Link for Conditionally including JSX " title="Link for Conditionally including JSX " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2> <p class="whitespace-pre-wrap my-4">In the previous example, you controlled which (if any!) JSX tree would be returned by the component. You may already have noticed some duplication in the render output:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span> ✅<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">is very similar to</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">Both of the conditional branches return <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><li className="item">...</li></code>:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br/></div><div class="cm-line "> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span> ✅<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span><br/></div><div class="cm-line "><span class="sp-syntax-punctuation">}</span><br/></div><div class="cm-line "><span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">While this duplication isn’t harmful, it could make your code harder to maintain. What if you want to change the <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">className</code>? You’d have to do it in two places in your code! In such a situation, you could conditionally include a little JSX to make your code more <a href="https://en.wikipedia.org/wiki/Don%27t_repeat_yourself" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">DRY.</a></p> <h3 id="conditional-ternary-operator--" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">Conditional (ternary) operator (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">? :</code>) <a href="#conditional-ternary-operator--" aria-label="Link for this heading" title="Link for this heading" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3> <p class="whitespace-pre-wrap my-4">JavaScript has a compact syntax for writing a conditional expression — the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">conditional operator</a> or “ternary operator”.</p> <p class="whitespace-pre-wrap my-4">Instead of this:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br/></div><div class="cm-line "> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span> ✅<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span><br/></div><div class="cm-line "><span class="sp-syntax-punctuation">}</span><br/></div><div class="cm-line "><span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">You can write this:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span><br/></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><br/></div><div class="cm-line "> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">isPacked</span> ? <span class="sp-syntax-plain">name</span> + <span class="sp-syntax-string">' ✅'</span> : <span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span><br/></div><div class="cm-line "> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><br/></div><div class="cm-line "><span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">You can read it as <em>“if <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked</code> is true, then (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">?</code>) render <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">name + ' ✅'</code>, otherwise (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">:</code>) render <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">name</code>”</em>.</p> <details class="my-12 rounded-2xl shadow-inner-border dark:shadow-inner-border-dark relative dark:bg-opacity-20 dark:bg-purple-60 bg-purple-5"><summary class="list-none p-8" tabindex="-1"><h5 class="mb-4 uppercase font-bold flex items-center text-sm dark:text-purple-30 text-purple-50"><svg class="inline me-2 dark:text-purple-30 text-purple-40" width="1.5em" height="1.5em" viewBox="0 0 72 72" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M34.7409 59.7228L32.9567 58.9094C27.2672 56.3157 20.7328 56.3157 15.0433 58.9094C12.6018 60.0224 9.39163 59.0275 8.44602 56.0621C7.45647 52.9589 5.99975 46.5898 6 35.9997C6.00029 23.5648 8.00803 18.3599 9.11099 16.4196C9.67795 15.4222 10.5255 14.8455 11.2254 14.5264L12.0179 14.1651C19.6351 10.6926 28.4011 10.6738 36 14.1733C43.5989 10.6738 52.3649 10.6926 59.9821 14.1651L60.7746 14.5264C61.4745 14.8455 62.3221 15.4222 62.889 16.4196C63.992 18.3599 65.9997 23.5648 66 35.9997C66.0002 46.5898 64.5435 52.9589 63.554 56.0621C62.6084 59.0275 59.3982 60.0224 56.9567 58.9094C51.2672 56.3157 44.7328 56.3157 39.0433 58.9094L37.2591 59.7228C37.1986 59.7508 37.1373 59.7767 37.0753 59.8004C36.4484 60.0411 35.7556 60.0653 35.1102 59.8648C34.9847 59.8258 34.8613 59.7784 34.7409 59.7228ZM14.5068 19.6246C20.3733 16.9501 27.0874 16.8775 33 19.4067V52.473C26.7613 50.32 19.9378 50.471 13.7811 52.9261C13.0005 49.9843 11.9998 44.547 12 35.9998C12.0002 25.5786 13.4879 21.1893 14.1179 19.8018L14.5068 19.6246ZM39 52.473C45.2387 50.32 52.0622 50.471 58.2189 52.9261C58.9995 49.9843 60.0002 44.547 60 35.9998C59.9998 25.5786 58.5121 21.1893 57.8821 19.8018L57.4932 19.6246C51.6267 16.9501 44.9126 16.8775 39 19.4067V52.473Z" fill="currentColor"></path></svg>Deep Dive</h5><div class="mb-4"><h4 id="are-these-two-examples-fully-equivalent" class="mdx-heading text-xl font-bold text-primary dark:text-primary-dark text-xl font-display font-bold leading-9 my-4">Are these two examples fully equivalent? <a href="#are-these-two-examples-fully-equivalent" aria-label="Link for Are these two examples fully equivalent? 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" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h4></div><button class="bg-purple-50 border-purple-50 hover:bg-purple-40 focus:bg-purple-50 active:bg-purple-50 text-base leading-tight font-bold rounded-full py-2 px-4 focus:outline focus:outline-offset-2 focus:outline-link dark:focus:outline-link-dark inline-flex items-center my-1 bg-link border-link text-white hover:bg-link focus:bg-link active:bg-link"><span class="me-1"><svg class="rotate-0" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></span>Show Details</button></summary><div class="p-8 border-t dark:border-purple-60 border-purple-10 "><p class="whitespace-pre-wrap my-4">If you’re coming from an object-oriented programming background, you might assume that the two examples above are subtly different because one of them may create two different “instances” of <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><li></code>. But JSX elements aren’t “instances” because they don’t hold any internal state and aren’t real DOM nodes. They’re lightweight descriptions, like blueprints. So these two examples, in fact, <em>are</em> completely equivalent. <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/preserving-and-resetting-state">Preserving and Resetting State</a> goes into detail about how this works.</p></div></details> <p class="whitespace-pre-wrap my-4">Now let’s say you want to wrap the completed item’s text into another HTML tag, like <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><del></code> to strike it out. 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style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Item</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-property">name</span><span class="sp-syntax-punctuation">,</span> <span class="sp-syntax-property">isPacked</span> <span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">isPacked</span> ? <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">del</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span> + <span class="sp-syntax-string">' ✅'</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">del</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span> : <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-plain">name</span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">PackingList</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Sally Ride's Packing List<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Space suit"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Helmet with a golden leaf"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">false</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Photo of Tam"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> </pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 xl:order-last border-b-1 relative top-0"><span class="flex p-2 focus:outline-none text-primary dark:text-primary-dark leading-[20px]"><svg class="rotate-0 inline me-1.5 text-xl" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg>Show more</span></button></div></div></div></div><div class="max-w-4xl ms-0 2xl:mx-auto"> <p class="whitespace-pre-wrap my-4">This style works well for simple conditions, but use it in moderation. If your components get messy with too much nested conditional markup, consider extracting child components to clean things up. In React, markup is a part of your code, so you can use tools like variables and functions to tidy up complex expressions.</p> <h3 id="logical-and-operator-" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">Logical AND operator (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">&&</code>) <a href="#logical-and-operator-" aria-label="Link for this heading" title="Link for this heading" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3> <p class="whitespace-pre-wrap my-4">Another common shortcut you’ll encounter is the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND#:~:text=The%20logical%20AND%20(%20%26%26%20)%20operator,it%20returns%20a%20Boolean%20value." target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">JavaScript logical AND (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">&&</code>) operator.</a> Inside React components, it often comes up when you want to render some JSX when the condition is true, <strong class="font-bold">or render nothing otherwise.</strong> With <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">&&</code>, you could conditionally render the checkmark only if <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked</code> is <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">true</code>:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span><br/></div><div class="cm-line "> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><br/></div><div class="cm-line "> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">isPacked</span> && <span class="sp-syntax-string">'✅'</span><span class="sp-syntax-punctuation">}</span><br/></div><div class="cm-line "> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span><br/></div><div class="cm-line "><span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">You can read this as <em>“if <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked</code>, then (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">&&</code>) render the checkmark, otherwise, render nothing”</em>.</p> <p class="whitespace-pre-wrap my-4">Here it is in action:</p> </div><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border dark:border-border-dark rounded-t-lg text-lg"><div class="flex-1 grow min-w-0 px-4 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21.5607C21.842 21.2794 22 20.8978 22 20.5V13.5C22 13.3674 21.9473 13.2402 21.8536 13.1464C21.7598 13.0527 21.6326 13 21.5 13Z" fill="currentColor"></path></svg><span class="hidden md:block">Fork</span></a></div></div><div class=" sp-layout"><div class=" sp-editor sp-stack"><div class=" sp-code-editor"><div aria-autocomplete="list" aria-label="Code Editor for App.js" aria-multiline="true" class="sp-pristine sp-javascript sp-cm" role="textbox" tabindex="0" translate="no"><pre class=" sp-pre-placeholder" style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Item</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-property">name</span><span class="sp-syntax-punctuation">,</span> <span class="sp-syntax-property">isPacked</span> <span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">isPacked</span> && <span class="sp-syntax-string">'✅'</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">PackingList</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Sally Ride's Packing List<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Space suit"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Helmet with a golden leaf"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">false</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Photo of Tam"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> </pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 xl:order-last border-b-1 relative top-0"><span class="flex p-2 focus:outline-none text-primary dark:text-primary-dark leading-[20px]"><svg class="rotate-0 inline me-1.5 text-xl" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg>Show more</span></button></div></div></div></div><div class="max-w-4xl ms-0 2xl:mx-auto"> <p class="whitespace-pre-wrap my-4">A <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">JavaScript && expression</a> returns the value of its right side (in our case, the checkmark) if the left side (our condition) is <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">true</code>. But if the condition is <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">false</code>, the whole expression becomes <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">false</code>. React considers <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">false</code> as a “hole” in the JSX tree, just like <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">null</code> or <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">undefined</code>, and doesn’t render anything in its place.</p> <div class="expandable-callout pt-8 pb-4 px-5 sm:px-8 my-8 relative rounded-none shadow-inner-border -mx-5 sm:mx-auto sm:rounded-2xl bg-yellow-5 dark:bg-yellow-60 dark:bg-opacity-20"><h3 class="text-2xl font-display font-bold text-yellow-50 dark:text-yellow-40"><svg class="inline me-3 mb-1 text-lg text-yellow-50 dark:text-yellow-40" width="2em" height="2em" viewBox="0 0 72 72" fill="none" xmlns="http://www.w3.org/2000/svg"><g clip-path="url(#clip0_738_836)"><path fill-rule="evenodd" clip-rule="evenodd" d="M27 48L27 57.3409L40.0772 48L55.6975 48C57.1595 48 58.1986 47.0112 58.3851 45.8604C59.1824 40.9398 60 34.619 60 29.625C60 24.7282 59.2125 18.7546 58.4302 14.0813C58.2445 12.9721 57.2326 12 55.7805 12L16.2195 12C14.7674 12 13.7555 12.9721 13.5698 14.0813C12.7875 18.7546 12 24.7282 12 29.625C12 34.619 12.8176 40.9398 13.6149 45.8604C13.8014 47.0112 14.8404 48 16.3025 48H27ZM42 54H55.6975C59.9534 54 63.6271 51.0213 64.3078 46.8201C65.1161 41.8322 66 35.1209 66 29.625C66 24.2196 65.1449 17.8522 64.3478 13.0906C63.6513 8.93026 59.9987 6 55.7805 6H16.2195C12.0013 6 8.34867 8.93026 7.65218 13.0906C6.85505 17.8522 6 24.2196 6 29.625C6 35.1209 6.88391 41.8322 7.69215 46.8201C8.37291 51.0213 12.0466 54 16.3025 54H21L21 63.1704C21 65.6106 23.7581 67.0299 25.7437 65.6116L42 54ZM39 39.3686C39 40.9422 38 41.9912 36 41.9912C34 41.9912 33 40.9422 33 39.3686C33 37.7951 34 36.746 36 36.746C38 36.746 39 37.7951 39 39.3686ZM38.1771 20.2412C38.1771 18.9986 37.1697 17.9912 35.9271 17.9912C34.6845 17.9912 33.6771 18.9986 33.6771 20.2412V31.5956C33.6771 32.8382 34.6845 33.8456 35.9271 33.8456C37.1697 33.8456 38.1771 32.8382 38.1771 31.5956V20.2412Z" fill="currentColor"></path></g><defs><clipPath id="clip0_738_836"><rect width="72" height="72" fill="white"></rect></clipPath></defs></svg>Pitfall</h3><div class="relative"><div class="py-2"><p class="whitespace-pre-wrap my-4"><strong class="font-bold">Don’t put numbers on the left side of <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">&&</code>.</strong></p><p class="whitespace-pre-wrap my-4">To test the condition, JavaScript converts the left side to a boolean automatically. However, if the left side is <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">0</code>, then the whole expression gets that value (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">0</code>), and React will happily render <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">0</code> rather than nothing.</p><p class="whitespace-pre-wrap my-4">For example, a common mistake is to write code like <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">messageCount && <p>New messages</p></code>. It’s easy to assume that it renders nothing when <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">messageCount</code> is <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">0</code>, but it really renders the <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">0</code> itself!</p><p class="whitespace-pre-wrap my-4">To fix it, make the left side a boolean: <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">messageCount > 0 && <p>New messages</p></code>.</p></div></div></div> <h3 id="conditionally-assigning-jsx-to-a-variable" class="mdx-heading text-2xl font-display leading-9 text-primary dark:text-primary-dark font-bold my-6">Conditionally assigning JSX to a variable <a href="#conditionally-assigning-jsx-to-a-variable" aria-label="Link for Conditionally assigning JSX to a variable " title="Link for Conditionally assigning JSX to a variable " class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h3> <p class="whitespace-pre-wrap my-4">When the shortcuts get in the way of writing plain code, try using an <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">if</code> statement and a variable. You can reassign variables defined with <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal"><code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">let</code></a>, so start by providing the default content you want to display, the name:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">let</span> <span class="sp-syntax-plain">itemContent</span> = <span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">;</span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">Use an <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">if</code> statement to reassign a JSX expression to <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">itemContent</code> if <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked</code> is <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">true</code>:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span><br/></div><div class="cm-line "> <span class="sp-syntax-plain">itemContent</span> = <span class="sp-syntax-plain">name</span> + <span class="sp-syntax-string">" ✅"</span><span class="sp-syntax-punctuation">;</span><br/></div><div class="cm-line "><span class="sp-syntax-punctuation">}</span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4"><a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/javascript-in-jsx-with-curly-braces#using-curly-braces-a-window-into-the-javascript-world">Curly braces open the “window into JavaScript”.</a> Embed the variable with curly braces in the returned JSX tree, nesting the previously calculated expression inside of JSX:</p> <div dir="ltr" class="sandpack sandpack--codeblock rounded-2xl h-full w-full overflow-x-auto flex items-center bg-wash dark:bg-gray-95 shadow-lg my-8" style="contain:content"><div class="sp-wrapper"><div class="sp-stack"><div class="sp-code-editor"><pre class="sp-cm sp-pristine sp-javascript flex align-start"><code class="sp-pre-placeholder grow-[2]"><div class="cm-line "><span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span><br/></div><div class="cm-line "> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">itemContent</span><span class="sp-syntax-punctuation">}</span><br/></div><div class="cm-line "><span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span></div></code></pre></div></div></div></div> <p class="whitespace-pre-wrap my-4">This style is the most verbose, but it’s also the most flexible. 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class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Item</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-property">name</span><span class="sp-syntax-punctuation">,</span> <span class="sp-syntax-property">isPacked</span> <span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">let</span> <span class="sp-syntax-plain">itemContent</span> = <span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-plain">itemContent</span> = <span class="sp-syntax-plain">name</span> + <span class="sp-syntax-string">" ✅"</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">itemContent</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">PackingList</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Sally Ride's Packing List<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Space suit"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Helmet with a golden leaf"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">false</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Photo of Tam"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> </pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 xl:order-last border-b-1 relative top-0"><span class="flex p-2 focus:outline-none text-primary dark:text-primary-dark leading-[20px]"><svg class="rotate-0 inline me-1.5 text-xl" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg>Show more</span></button></div></div></div></div><div class="max-w-4xl ms-0 2xl:mx-auto"> <p class="whitespace-pre-wrap my-4">Like before, this works not only for text, but for arbitrary JSX too:</p> </div><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border dark:border-border-dark rounded-t-lg text-lg"><div class="flex-1 grow min-w-0 px-4 lg:px-6"><div><div class="relative overflow-hidden"><div class="w-[fit-content] invisible"><div class=" sp-tabs" translate="no"><div aria-label="Select active file" class=" sp-tabs-scrollable-container" role="tablist"><button aria-selected="true" class=" sp-tab-button" data-active="true" role="tab" title="/src/App.js" type="button">App.js</button></div></div></div><button class="absolute top-0 start-[2px]" 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sp-cm" role="textbox" tabindex="0" translate="no"><pre class=" sp-pre-placeholder" style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Item</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-property">name</span><span class="sp-syntax-punctuation">,</span> <span class="sp-syntax-property">isPacked</span> <span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">let</span> <span class="sp-syntax-plain">itemContent</span> = <span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-keyword">if</span> <span class="sp-syntax-punctuation">(</span><span class="sp-syntax-plain">isPacked</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-plain">itemContent</span> = <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">del</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span> + <span class="sp-syntax-string">" ✅"</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">del</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">itemContent</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">PackingList</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Sally Ride's Packing List<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Space suit"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Helmet with a golden leaf"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">false</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Photo of Tam"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> </pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 xl:order-last border-b-1 relative top-0"><span class="flex p-2 focus:outline-none text-primary dark:text-primary-dark leading-[20px]"><svg class="rotate-0 inline me-1.5 text-xl" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg>Show more</span></button></div></div></div></div><div class="max-w-4xl ms-0 2xl:mx-auto"> <p class="whitespace-pre-wrap my-4">If you’re not familiar with JavaScript, this variety of styles might seem overwhelming at first. However, learning them will help you read and write any JavaScript code — and not just React components! Pick the one you prefer for a start, and then consult this reference again if you forget how the other ones work.</p> <section><h2 id="recap" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6">Recap<a href="#recap" aria-label="Link for Recap" title="Link for Recap" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2><ul class="ms-6 my-3 list-disc"> <li class="leading-relaxed mb-1">In React, you control branching logic with JavaScript.</li> <li class="leading-relaxed mb-1">You can return a JSX expression conditionally with an <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">if</code> statement.</li> <li class="leading-relaxed mb-1">You can conditionally save some JSX to a variable and then include it inside other JSX by using the curly braces.</li> <li class="leading-relaxed mb-1">In JSX, <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">{cond ? <A /> : <B />}</code> means <em>“if <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">cond</code>, render <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><A /></code>, otherwise <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><B /></code>”</em>.</li> <li class="leading-relaxed mb-1">In JSX, <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">{cond && <A />}</code> means <em>“if <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">cond</code>, render <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px"><A /></code>, otherwise nothing”</em>.</li> <li class="leading-relaxed mb-1">The shortcuts are common, but you don’t have to use them if you prefer plain <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">if</code>.</li> </ul></section> </div><div class="max-w-7xl mx-auto py-4 w-full"><div class="border-gray-10 bg-card dark:bg-card-dark shadow-inner rounded-none -mx-5 sm:mx-auto sm:rounded-2xl"><div class="py-2 px-5 sm:px-8 pb-0 md:pb-0"><h2 id="challenges" class="mdx-heading text-3xl font-display leading-10 text-primary dark:text-primary-dark font-bold my-6 mb-2 leading-10 relative text-3xl text-link">Try out some challenges<a href="#challenges" aria-label="Link for Try out some challenges" title="Link for Try out some challenges" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h2><div class="flex items-center justify-between"><div class="overflow-hidden"><div class="flex relative transition-transform content-box overflow-x-auto"><button class="py-2 me-4 text-base border-b-4 duration-100 ease-in transition whitespace-nowrap text-ellipsis text-link border-link hover:text-link dark:text-link-dark dark:border-link-dark dark:hover:text-link-dark">1. Show an icon for incomplete items with <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">? :</code> </button><button class="py-2 me-4 text-base border-b-4 duration-100 ease-in transition whitespace-nowrap text-ellipsis">2. Show the item importance with <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">&&</code> </button><button class="py-2 me-4 text-base border-b-4 duration-100 ease-in transition whitespace-nowrap text-ellipsis">3. Refactor a series of <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">? :</code> to <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">if</code> and variables </button></div></div><div class="flex z-10 pb-2 ps-2"><button aria-label="Scroll left" class="bg-secondary-button dark:bg-secondary-button-dark h-8 px-2 rounded-l border-gray-20 border-r rtl:rotate-180 text-gray-30"><svg class="rotate-90 rtl:-rotate-90" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></button><button aria-label="Scroll right" class="bg-secondary-button dark:bg-secondary-button-dark h-8 px-2 rounded-e rtl:rotate-180 text-primary dark:text-primary-dark"><svg class="-rotate-90 rtl:rotate-90" xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><g fill="none" fill-rule="evenodd" transform="translate(-446 -398)"><path fill="currentColor" fill-rule="nonzero" d="M95.8838835,240.366117 C95.3957281,239.877961 94.6042719,239.877961 94.1161165,240.366117 C93.6279612,240.854272 93.6279612,241.645728 94.1161165,242.133883 L98.6161165,246.633883 C99.1042719,247.122039 99.8957281,247.122039 100.383883,246.633883 L104.883883,242.133883 C105.372039,241.645728 105.372039,240.854272 104.883883,240.366117 C104.395728,239.877961 103.604272,239.877961 103.116117,240.366117 L99.5,243.982233 L95.8838835,240.366117 Z" transform="translate(356.5 164.5)"></path><polygon points="446 418 466 418 466 398 446 398"></polygon></g></svg></button></div></div></div><div class="p-5 sm:py-8 sm:px-8"><div><h4 id="show-an-icon-for-incomplete-items-with--" class="mdx-heading text-xl text-primary dark:text-primary-dark mb-2 mt-0 font-medium text-xl font-display font-bold leading-9 my-4"><div class="font-bold block md:inline">Challenge 1 of 3<span class="text-primary dark:text-primary-dark">: </span></div>Show an icon for incomplete items with <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">? :</code> <a href="#show-an-icon-for-incomplete-items-with--" aria-label="Link for this heading" title="Link for this heading" class="mdx-header-anchor inline-block"><svg width="1em" height="1em" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg" class="text-gray-70 ms-2 h-5 w-5"><g fill="currentColor" fill-rule="evenodd"><path d="M7.778 7.975a2.5 2.5 0 0 0 .347-3.837L6.017 2.03a2.498 2.498 0 0 0-3.542-.007 2.5 2.5 0 0 0 .006 3.543l1.153 1.15c.07-.29.154-.563.25-.773.036-.077.084-.16.14-.25L3.18 4.85a1.496 1.496 0 0 1 .002-2.12 1.496 1.496 0 0 1 2.12 0l2.124 2.123a1.496 1.496 0 0 1-.333 2.37c.16.246.42.504.685.752z"></path><path d="M5.657 4.557a2.5 2.5 0 0 0-.347 3.837l2.108 2.108a2.498 2.498 0 0 0 3.542.007 2.5 2.5 0 0 0-.006-3.543L9.802 5.815c-.07.29-.154.565-.25.774-.036.076-.084.16-.14.25l.842.84c.585.587.59 1.532 0 2.122-.587.585-1.532.59-2.12 0L6.008 7.68a1.496 1.496 0 0 1 .332-2.372c-.16-.245-.42-.503-.685-.75z"></path></g></svg></a></h4><p class="whitespace-pre-wrap my-4">Use the conditional operator (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">cond ? a : b</code>) to render a ❌ if <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">isPacked</code> isn’t <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">true</code>.</p><div class="sandpack sandpack--playground w-full my-8" dir="ltr"><div class="sp-wrapper"><div class="shadow-lg dark:shadow-lg-dark rounded-lg" style="contain:content"><div class="bg-wash dark:bg-card-dark flex justify-between items-center relative z-10 border-b border-border dark:border-border-dark rounded-t-lg text-lg"><div class="flex-1 grow min-w-0 px-4 lg:px-6"><div><div class="relative overflow-hidden"><div class="w-[fit-content] invisible"><div class=" sp-tabs" translate="no"><div aria-label="Select active file" class=" sp-tabs-scrollable-container" role="tablist"><button 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15.3129 17.7328 16.5562C17.0708 17.7996 16.0227 18.7942 14.7463 19.3902C13.47 19.9861 12.0345 20.1511 10.6563 19.8603C9.27798 19.5695 8.03152 18.8387 7.10469 17.778C6.17786 16.7172 5.62086 15.384 5.51761 13.9791C5.51156 13.8512 5.45689 13.7303 5.36477 13.6413C5.27265 13.5522 5.15001 13.5017 5.02191 13.5H4.02081C3.95297 13.4996 3.88574 13.5129 3.8232 13.5392C3.76065 13.5655 3.70408 13.6042 3.6569 13.6529C3.60972 13.7017 3.57291 13.7595 3.54869 13.8228C3.52448 13.8862 3.51336 13.9538 3.51601 14.0216C3.61349 15.5965 4.1473 17.1132 5.0577 18.4019C5.9681 19.6906 7.21917 20.7006 8.6709 21.3188C10.1226 21.937 11.7178 22.139 13.2778 21.9022C14.8378 21.6654 16.3011 20.9992 17.504 19.978C18.7069 18.9569 19.6019 17.6212 20.0889 16.1203C20.5759 14.6195 20.6356 13.0128 20.2614 11.4799C19.8872 9.94705 19.0938 8.54858 17.97 7.44098C16.8462 6.33339 15.4363 5.56037 13.8982 5.20844V5.20844Z" fill="currentColor"></path></svg> Reset</button><a 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16.4594C8.95831 16.4341 9.01362 16.3969 9.0601 16.35L20.0001 5.41V8.5C20.0001 8.63261 20.0528 8.75979 20.1465 8.85355C20.2403 8.94732 20.3675 9 20.5001 9H21.5001C21.6327 9 21.7599 8.94732 21.8537 8.85355C21.9474 8.75979 22.0001 8.63261 22.0001 8.5V3.5C22.0001 3.10218 21.8421 2.72064 21.5608 2.43934C21.2795 2.15804 20.8979 2 20.5001 2V2Z" fill="currentColor"></path><path d="M21.5 13H20.5C20.3674 13 20.2402 13.0527 20.1464 13.1464C20.0527 13.2402 20 13.3674 20 13.5V20H4V4H10.5C10.6326 4 10.7598 3.94732 10.8536 3.85355C10.9473 3.75979 11 3.63261 11 3.5V2.5C11 2.36739 10.9473 2.24021 10.8536 2.14645C10.7598 2.05268 10.6326 2 10.5 2H3.5C3.10218 2 2.72064 2.15804 2.43934 2.43934C2.15804 2.72064 2 3.10218 2 3.5V20.5C2 20.8978 2.15804 21.2794 2.43934 21.5607C2.72064 21.842 3.10218 22 3.5 22H20.5C20.8978 22 21.2794 21.842 21.5607 21.5607C21.842 21.2794 22 20.8978 22 20.5V13.5C22 13.3674 21.9473 13.2402 21.8536 13.1464C21.7598 13.0527 21.6326 13 21.5 13Z" fill="currentColor"></path></svg><span class="hidden md:block">Fork</span></a></div></div><div class=" sp-layout"><div class=" sp-editor sp-stack"><div class=" sp-code-editor"><div aria-autocomplete="list" aria-label="Code Editor for App.js" aria-multiline="true" class="sp-pristine sp-javascript sp-cm" role="textbox" tabindex="0" translate="no"><pre class=" sp-pre-placeholder" style="margin-left:var(--sp-space-11)"><span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">Item</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-property">name</span><span class="sp-syntax-punctuation">,</span> <span class="sp-syntax-property">isPacked</span> <span class="sp-syntax-punctuation">}</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">li</span> <span class="sp-syntax-property">className</span>=<span class="sp-syntax-string">"item"</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">name</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation">{</span><span class="sp-syntax-plain">isPacked</span> && <span class="sp-syntax-string">'✅'</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">li</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-keyword">export</span> <span class="sp-syntax-keyword">default</span> <span class="sp-syntax-keyword">function</span> <span class="sp-syntax-definition">PackingList</span><span class="sp-syntax-punctuation">(</span><span class="sp-syntax-punctuation">)</span> <span class="sp-syntax-punctuation">{</span> <span class="sp-syntax-keyword">return</span> <span class="sp-syntax-punctuation">(</span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span>Sally Ride's Packing List<span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">h1</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Space suit"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">true</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Helmet with a golden leaf"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"><</span><span class="sp-syntax-definition">Item</span> <span class="sp-syntax-property">isPacked</span>=<span class="sp-syntax-punctuation">{</span><span class="sp-syntax-static">false</span><span class="sp-syntax-punctuation">}</span> <span class="sp-syntax-property">name</span>=<span class="sp-syntax-string">"Photo of Tam"</span> <span class="sp-syntax-punctuation">/></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">ul</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation"></</span><span class="sp-syntax-tag">section</span><span class="sp-syntax-punctuation">></span> <span class="sp-syntax-punctuation">)</span><span class="sp-syntax-punctuation">;</span> <span class="sp-syntax-punctuation">}</span> </pre></div></div></div><div class=" order-last xl:order-2 sp-stack"><div class="p-0 sm:p-2 md:p-4 lg:p-8 bg-card dark:bg-wash-dark h-full relative md:rounded-b-lg lg:rounded-b-none"><div style="position:relative"><iframe class="rounded-t-none bg-white md:shadow-md sm:rounded-lg w-full max-w-full transition-opacity absolute opacity-0 pointer-events-none duration-75" title="Sandbox Preview" style="height:15px;z-index:-1"></iframe></div></div></div><button translate="yes" class="sandpack-expand flex text-base justify-between dark:border-card-dark bg-wash dark:bg-card-dark items-center z-10 p-1 w-full order-2 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1.03.9 1.52 2.34 1.08 2.91.83.1-.65.35-1.09.63-1.34-2.22-.25-4.55-1.11-4.55-4.94 0-1.1.39-1.99 1.03-2.69a3.6 3.6 0 0 1 .1-2.64s.84-.27 2.75 1.02a9.58 9.58 0 0 1 5 0c1.91-1.3 2.75-1.02 2.75-1.02.55 1.37.2 2.4.1 2.64.64.7 1.03 1.6 1.03 2.69 0 3.84-2.34 4.68-4.57 4.93.36.31.68.92.68 1.85l-.01 2.75c0 .26.18.58.69.48A10 10 0 0 0 10 0"></path></svg></a></div></div></div></footer></div></div></main><div class="hidden -mt-16 lg:max-w-custom-xs 2xl:block"><nav role="navigation" class="pt-20 sticky top-0 end-0"><h2 class="mb-3 lg:mb-3 uppercase tracking-wide font-bold text-sm text-secondary dark:text-secondary-dark px-4 w-full">On this page</h2><div class="h-full overflow-y-auto ps-4 max-h-[calc(100vh-7.5rem)]" style="overscroll-behavior:contain"><ul class="space-y-2 pb-16"><li class="text-sm px-2 rounded-s-xl bg-highlight dark:bg-highlight-dark"><a class="text-link dark:text-link-dark font-bold block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#">Overview</a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#conditionally-returning-jsx">Conditionally returning JSX </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#conditionally-returning-nothing-with-null">Conditionally returning nothing with <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">null</code> </a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#conditionally-including-jsx">Conditionally including JSX </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#conditional-ternary-operator--">Conditional (ternary) operator (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">? :</code>) </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#logical-and-operator-">Logical AND operator (<code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">&&</code>) </a></li><li class="text-sm px-2 rounded-s-xl ps-4"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#conditionally-assigning-jsx-to-a-variable">Conditionally assigning JSX to a variable </a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#recap">Recap</a></li><li class="text-sm px-2 rounded-s-xl"><a class="text-secondary dark:text-secondary-dark block hover:text-link dark:hover:text-link-dark leading-normal py-2" href="#challenges">Challenges</a></li></ul></div></nav></div></div></div><script id="__NEXT_DATA__" type="application/json">{"props":{"pageProps":{"toc":"[{\"url\":\"#\",\"text\":\"Overview\",\"depth\":2},{\"url\":\"#conditionally-returning-jsx\",\"depth\":2,\"text\":\"Conditionally returning JSX \"},{\"url\":\"#conditionally-returning-nothing-with-null\",\"depth\":3,\"text\":[\"Conditionally returning nothing with \",[\"$r\",\"code\",null,{\"children\":\"null\"}],\" \"]},{\"url\":\"#conditionally-including-jsx\",\"depth\":2,\"text\":\"Conditionally including JSX \"},{\"url\":\"#conditional-ternary-operator--\",\"depth\":3,\"text\":[\"Conditional (ternary) operator (\",[\"$r\",\"code\",null,{\"children\":\"? :\"}],\") \"]},{\"url\":\"#logical-and-operator-\",\"depth\":3,\"text\":[\"Logical AND operator (\",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\") \"]},{\"url\":\"#conditionally-assigning-jsx-to-a-variable\",\"depth\":3,\"text\":\"Conditionally assigning JSX to a variable \"},{\"url\":\"#recap\",\"depth\":2,\"text\":\"Recap\"},{\"url\":\"#challenges\",\"depth\":2,\"text\":\"Challenges\"}]","content":"[[\"$r\",\"MaxWidth\",\"8\",{\"children\":[[\"$r\",\"Intro\",null,{\"children\":[\"$r\",\"p\",null,{\"children\":[\"Your components will often need to display different things depending on different conditions. In React, you can conditionally render JSX using JavaScript syntax like \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\" statements, \",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\", and \",[\"$r\",\"code\",null,{\"children\":\"? :\"}],\" operators.\"]}]}],\"\\n\",[\"$r\",\"YouWillLearn\",null,{\"children\":[\"$r\",\"ul\",null,{\"children\":[\"\\n\",[\"$r\",\"li\",null,{\"children\":\"How to return different JSX depending on a condition\"}],\"\\n\",[\"$r\",\"li\",null,{\"children\":\"How to conditionally include or exclude a piece of JSX\"}],\"\\n\",[\"$r\",\"li\",null,{\"children\":\"Common conditional syntax shortcuts you’ll encounter in React codebases\"}],\"\\n\"]}]}],\"\\n\",[\"$r\",\"h2\",null,{\"id\":\"conditionally-returning-jsx\",\"children\":\"Conditionally returning JSX \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Let’s say you have a \",[\"$r\",\"code\",null,{\"children\":\"PackingList\"}],\" component rendering several \",[\"$r\",\"code\",null,{\"children\":\"Item\"}],\"s, which can be marked as packed or not:\"]}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n return \u003cli className=\\\"item\\\"\u003e{name}\u003c/li\u003e;\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"MaxWidth\",\"18\",{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Notice that some of the \",[\"$r\",\"code\",null,{\"children\":\"Item\"}],\" components have their \",[\"$r\",\"code\",null,{\"children\":\"isPacked\"}],\" prop set to \",[\"$r\",\"code\",null,{\"children\":\"true\"}],\" instead of \",[\"$r\",\"code\",null,{\"children\":\"false\"}],\". You want to add a checkmark (✅) to packed items if \",[\"$r\",\"code\",null,{\"children\":\"isPacked={true}\"}],\".\"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"You can write this as an \",[\"$r\",\"a\",null,{\"href\":\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/if...else\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":[[\"$r\",\"code\",null,{\"children\":\"if\"}],\"/\",[\"$r\",\"code\",null,{\"children\":\"else\"}],\" statement\"]}],\" like so:\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"if (isPacked) {\\n return \u003cli className=\\\"item\\\"\u003e{name} ✅\u003c/li\u003e;\\n}\\nreturn \u003cli className=\\\"item\\\"\u003e{name}\u003c/li\u003e;\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"If the \",[\"$r\",\"code\",null,{\"children\":\"isPacked\"}],\" prop is \",[\"$r\",\"code\",null,{\"children\":\"true\"}],\", this code \",[\"$r\",\"strong\",null,{\"children\":\"returns a different JSX tree.\"}],\" With this change, some of the items get a checkmark at the end:\"]}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n if (isPacked) {\\n return \u003cli className=\\\"item\\\"\u003e{name} ✅\u003c/li\u003e;\\n }\\n return \u003cli className=\\\"item\\\"\u003e{name}\u003c/li\u003e;\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"MaxWidth\",\"32\",{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":\"Try editing what gets returned in either case, and see how the result changes!\"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Notice how you’re creating branching logic with JavaScript’s \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\" and \",[\"$r\",\"code\",null,{\"children\":\"return\"}],\" statements. In React, control flow (like conditions) is handled by JavaScript.\"]}],\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"conditionally-returning-nothing-with-null\",\"children\":[\"Conditionally returning nothing with \",[\"$r\",\"code\",null,{\"children\":\"null\"}],\" \"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"In some situations, you won’t want to render anything at all. For example, say you don’t want to show packed items at all. A component must return something. In this case, you can return \",[\"$r\",\"code\",null,{\"children\":\"null\"}],\":\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"if (isPacked) {\\n return null;\\n}\\nreturn \u003cli className=\\\"item\\\"\u003e{name}\u003c/li\u003e;\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"If \",[\"$r\",\"code\",null,{\"children\":\"isPacked\"}],\" is true, the component will return nothing, \",[\"$r\",\"code\",null,{\"children\":\"null\"}],\". Otherwise, it will return JSX to render.\"]}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n if (isPacked) {\\n return null;\\n }\\n return \u003cli className=\\\"item\\\"\u003e{name}\u003c/li\u003e;\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"MaxWidth\",\"70\",{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"In practice, returning \",[\"$r\",\"code\",null,{\"children\":\"null\"}],\" from a component isn’t common because it might surprise a developer trying to render it. More often, you would conditionally include or exclude the component in the parent component’s JSX. Here’s how to do that!\"]}],\"\\n\",[\"$r\",\"h2\",null,{\"id\":\"conditionally-including-jsx\",\"children\":\"Conditionally including JSX \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"In the previous example, you controlled which (if any!) JSX tree would be returned by the component. You may already have noticed some duplication in the render output:\"}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"\u003cli className=\\\"item\\\"\u003e{name} ✅\u003c/li\u003e\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"is very similar to\"}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"\u003cli className=\\\"item\\\"\u003e{name}\u003c/li\u003e\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Both of the conditional branches return \",[\"$r\",\"code\",null,{\"children\":\"\u003cli className=\\\"item\\\"\u003e...\u003c/li\u003e\"}],\":\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"if (isPacked) {\\n return \u003cli className=\\\"item\\\"\u003e{name} ✅\u003c/li\u003e;\\n}\\nreturn \u003cli className=\\\"item\\\"\u003e{name}\u003c/li\u003e;\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"While this duplication isn’t harmful, it could make your code harder to maintain. What if you want to change the \",[\"$r\",\"code\",null,{\"children\":\"className\"}],\"? You’d have to do it in two places in your code! In such a situation, you could conditionally include a little JSX to make your code more \",[\"$r\",\"a\",null,{\"href\":\"https://en.wikipedia.org/wiki/Don%27t_repeat_yourself\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"DRY.\"}]]}],\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"conditional-ternary-operator--\",\"children\":[\"Conditional (ternary) operator (\",[\"$r\",\"code\",null,{\"children\":\"? :\"}],\") \"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"JavaScript has a compact syntax for writing a conditional expression — the \",[\"$r\",\"a\",null,{\"href\":\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"conditional operator\"}],\" or “ternary operator”.\"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"Instead of this:\"}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"if (isPacked) {\\n return \u003cli className=\\\"item\\\"\u003e{name} ✅\u003c/li\u003e;\\n}\\nreturn \u003cli className=\\\"item\\\"\u003e{name}\u003c/li\u003e;\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"You can write this:\"}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"return (\\n \u003cli className=\\\"item\\\"\u003e\\n {isPacked ? name + ' ✅' : name}\\n \u003c/li\u003e\\n);\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"You can read it as \",[\"$r\",\"em\",null,{\"children\":[\"“if \",[\"$r\",\"code\",null,{\"children\":\"isPacked\"}],\" is true, then (\",[\"$r\",\"code\",null,{\"children\":\"?\"}],\") render \",[\"$r\",\"code\",null,{\"children\":\"name + ' ✅'\"}],\", otherwise (\",[\"$r\",\"code\",null,{\"children\":\":\"}],\") render \",[\"$r\",\"code\",null,{\"children\":\"name\"}],\"”\"]}],\".\"]}],\"\\n\",[\"$r\",\"DeepDive\",null,{\"children\":[[\"$r\",\"h4\",null,{\"id\":\"are-these-two-examples-fully-equivalent\",\"children\":\"Are these two examples fully equivalent? \"}],[\"$r\",\"p\",null,{\"children\":[\"If you’re coming from an object-oriented programming background, you might assume that the two examples above are subtly different because one of them may create two different “instances” of \",[\"$r\",\"code\",null,{\"children\":\"\u003cli\u003e\"}],\". But JSX elements aren’t “instances” because they don’t hold any internal state and aren’t real DOM nodes. They’re lightweight descriptions, like blueprints. So these two examples, in fact, \",[\"$r\",\"em\",null,{\"children\":\"are\"}],\" completely equivalent. \",[\"$r\",\"a\",null,{\"href\":\"/learn/preserving-and-resetting-state\",\"children\":\"Preserving and Resetting State\"}],\" goes into detail about how this works.\"]}]]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Now let’s say you want to wrap the completed item’s text into another HTML tag, like \",[\"$r\",\"code\",null,{\"children\":\"\u003cdel\u003e\"}],\" to strike it out. You can add even more newlines and parentheses so that it’s easier to nest more JSX in each of the cases:\"]}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n return (\\n \u003cli className=\\\"item\\\"\u003e\\n {isPacked ? (\\n \u003cdel\u003e\\n {name + ' ✅'}\\n \u003c/del\u003e\\n ) : (\\n name\\n )}\\n \u003c/li\u003e\\n );\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"MaxWidth\",\"84\",{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":\"This style works well for simple conditions, but use it in moderation. If your components get messy with too much nested conditional markup, consider extracting child components to clean things up. In React, markup is a part of your code, so you can use tools like variables and functions to tidy up complex expressions.\"}],\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"logical-and-operator-\",\"children\":[\"Logical AND operator (\",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\") \"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Another common shortcut you’ll encounter is the \",[\"$r\",\"a\",null,{\"href\":\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND#:~:text=The%20logical%20AND%20(%20%26%26%20)%20operator,it%20returns%20a%20Boolean%20value.\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":[\"JavaScript logical AND (\",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\") operator.\"]}],\" Inside React components, it often comes up when you want to render some JSX when the condition is true, \",[\"$r\",\"strong\",null,{\"children\":\"or render nothing otherwise.\"}],\" With \",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\", you could conditionally render the checkmark only if \",[\"$r\",\"code\",null,{\"children\":\"isPacked\"}],\" is \",[\"$r\",\"code\",null,{\"children\":\"true\"}],\":\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"return (\\n \u003cli className=\\\"item\\\"\u003e\\n {name} {isPacked \u0026\u0026 '✅'}\\n \u003c/li\u003e\\n);\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"You can read this as \",[\"$r\",\"em\",null,{\"children\":[\"“if \",[\"$r\",\"code\",null,{\"children\":\"isPacked\"}],\", then (\",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\") render the checkmark, otherwise, render nothing”\"]}],\".\"]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"Here it is in action:\"}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n return (\\n \u003cli className=\\\"item\\\"\u003e\\n {name} {isPacked \u0026\u0026 '✅'}\\n \u003c/li\u003e\\n );\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"MaxWidth\",\"106\",{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"A \",[\"$r\",\"a\",null,{\"href\":\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":\"JavaScript \u0026\u0026 expression\"}],\" returns the value of its right side (in our case, the checkmark) if the left side (our condition) is \",[\"$r\",\"code\",null,{\"children\":\"true\"}],\". But if the condition is \",[\"$r\",\"code\",null,{\"children\":\"false\"}],\", the whole expression becomes \",[\"$r\",\"code\",null,{\"children\":\"false\"}],\". React considers \",[\"$r\",\"code\",null,{\"children\":\"false\"}],\" as a “hole” in the JSX tree, just like \",[\"$r\",\"code\",null,{\"children\":\"null\"}],\" or \",[\"$r\",\"code\",null,{\"children\":\"undefined\"}],\", and doesn’t render anything in its place.\"]}],\"\\n\",[\"$r\",\"Pitfall\",null,{\"children\":[[\"$r\",\"p\",null,{\"children\":[\"$r\",\"strong\",null,{\"children\":[\"Don’t put numbers on the left side of \",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\".\"]}]}],[\"$r\",\"p\",null,{\"children\":[\"To test the condition, JavaScript converts the left side to a boolean automatically. However, if the left side is \",[\"$r\",\"code\",null,{\"children\":\"0\"}],\", then the whole expression gets that value (\",[\"$r\",\"code\",null,{\"children\":\"0\"}],\"), and React will happily render \",[\"$r\",\"code\",null,{\"children\":\"0\"}],\" rather than nothing.\"]}],[\"$r\",\"p\",null,{\"children\":[\"For example, a common mistake is to write code like \",[\"$r\",\"code\",null,{\"children\":\"messageCount \u0026\u0026 \u003cp\u003eNew messages\u003c/p\u003e\"}],\". It’s easy to assume that it renders nothing when \",[\"$r\",\"code\",null,{\"children\":\"messageCount\"}],\" is \",[\"$r\",\"code\",null,{\"children\":\"0\"}],\", but it really renders the \",[\"$r\",\"code\",null,{\"children\":\"0\"}],\" itself!\"]}],[\"$r\",\"p\",null,{\"children\":[\"To fix it, make the left side a boolean: \",[\"$r\",\"code\",null,{\"children\":\"messageCount \u003e 0 \u0026\u0026 \u003cp\u003eNew messages\u003c/p\u003e\"}],\".\"]}]]}],\"\\n\",[\"$r\",\"h3\",null,{\"id\":\"conditionally-assigning-jsx-to-a-variable\",\"children\":\"Conditionally assigning JSX to a variable \"}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"When the shortcuts get in the way of writing plain code, try using an \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\" statement and a variable. You can reassign variables defined with \",[\"$r\",\"a\",null,{\"href\":\"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let\",\"target\":\"_blank\",\"rel\":\"nofollow noopener noreferrer\",\"children\":[\"$r\",\"code\",null,{\"children\":\"let\"}]}],\", so start by providing the default content you want to display, the name:\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"let itemContent = name;\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[\"Use an \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\" statement to reassign a JSX expression to \",[\"$r\",\"code\",null,{\"children\":\"itemContent\"}],\" if \",[\"$r\",\"code\",null,{\"children\":\"isPacked\"}],\" is \",[\"$r\",\"code\",null,{\"children\":\"true\"}],\":\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"if (isPacked) {\\n itemContent = name + \\\" ✅\\\";\\n}\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":[[\"$r\",\"a\",null,{\"href\":\"/learn/javascript-in-jsx-with-curly-braces#using-curly-braces-a-window-into-the-javascript-world\",\"children\":\"Curly braces open the “window into JavaScript”.\"}],\" Embed the variable with curly braces in the returned JSX tree, nesting the previously calculated expression inside of JSX:\"]}],\"\\n\",[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"\u003cli className=\\\"item\\\"\u003e\\n {itemContent}\\n\u003c/li\u003e\\n\"}]}],\"\\n\",[\"$r\",\"p\",null,{\"children\":\"This style is the most verbose, but it’s also the most flexible. Here it is in action:\"}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n let itemContent = name;\\n if (isPacked) {\\n itemContent = name + \\\" ✅\\\";\\n }\\n return (\\n \u003cli className=\\\"item\\\"\u003e\\n {itemContent}\\n \u003c/li\u003e\\n );\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"MaxWidth\",\"110\",{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":\"Like before, this works not only for text, but for arbitrary JSX too:\"}],\"\\n\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n let itemContent = name;\\n if (isPacked) {\\n itemContent = (\\n \u003cdel\u003e\\n {name + \\\" ✅\\\"}\\n \u003c/del\u003e\\n );\\n }\\n return (\\n \u003cli className=\\\"item\\\"\u003e\\n {itemContent}\\n \u003c/li\u003e\\n );\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"MaxWidth\",\"116\",{\"children\":[\"\\n\",[\"$r\",\"p\",null,{\"children\":\"If you’re not familiar with JavaScript, this variety of styles might seem overwhelming at first. However, learning them will help you read and write any JavaScript code — and not just React components! Pick the one you prefer for a start, and then consult this reference again if you forget how the other ones work.\"}],\"\\n\",[\"$r\",\"Recap\",null,{\"children\":[\"$r\",\"ul\",null,{\"children\":[\"\\n\",[\"$r\",\"li\",null,{\"children\":\"In React, you control branching logic with JavaScript.\"}],\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"You can return a JSX expression conditionally with an \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\" statement.\"]}],\"\\n\",[\"$r\",\"li\",null,{\"children\":\"You can conditionally save some JSX to a variable and then include it inside other JSX by using the curly braces.\"}],\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"In JSX, \",[\"$r\",\"code\",null,{\"children\":\"{cond ? \u003cA /\u003e : \u003cB /\u003e}\"}],\" means \",[\"$r\",\"em\",null,{\"children\":[\"“if \",[\"$r\",\"code\",null,{\"children\":\"cond\"}],\", render \",[\"$r\",\"code\",null,{\"children\":\"\u003cA /\u003e\"}],\", otherwise \",[\"$r\",\"code\",null,{\"children\":\"\u003cB /\u003e\"}],\"”\"]}],\".\"]}],\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"In JSX, \",[\"$r\",\"code\",null,{\"children\":\"{cond \u0026\u0026 \u003cA /\u003e}\"}],\" means \",[\"$r\",\"em\",null,{\"children\":[\"“if \",[\"$r\",\"code\",null,{\"children\":\"cond\"}],\", render \",[\"$r\",\"code\",null,{\"children\":\"\u003cA /\u003e\"}],\", otherwise nothing”\"]}],\".\"]}],\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"The shortcuts are common, but you don’t have to use them if you prefer plain \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\".\"]}],\"\\n\"]}]}],\"\\n\"]}],[\"$r\",\"Challenges\",null,{\"children\":[[\"$r\",\"h4\",null,{\"id\":\"show-an-icon-for-incomplete-items-with--\",\"children\":[\"Show an icon for incomplete items with \",[\"$r\",\"code\",null,{\"children\":\"? :\"}],\" \"]}],[\"$r\",\"p\",null,{\"children\":[\"Use the conditional operator (\",[\"$r\",\"code\",null,{\"children\":\"cond ? a : b\"}],\") to render a ❌ if \",[\"$r\",\"code\",null,{\"children\":\"isPacked\"}],\" isn’t \",[\"$r\",\"code\",null,{\"children\":\"true\"}],\".\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n return (\\n \u003cli className=\\\"item\\\"\u003e\\n {name} {isPacked \u0026\u0026 '✅'}\\n \u003c/li\u003e\\n );\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"Solution\",null,{\"children\":[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, isPacked }) {\\n return (\\n \u003cli className=\\\"item\\\"\u003e\\n {name} {isPacked ? '✅' : '❌'}\\n \u003c/li\u003e\\n );\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n isPacked={true} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n isPacked={false} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}]}],[\"$r\",\"h4\",null,{\"id\":\"show-the-item-importance-with-\",\"children\":[\"Show the item importance with \",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\" \"]}],[\"$r\",\"p\",null,{\"children\":[\"In this example, each \",[\"$r\",\"code\",null,{\"children\":\"Item\"}],\" receives a numerical \",[\"$r\",\"code\",null,{\"children\":\"importance\"}],\" prop. Use the \",[\"$r\",\"code\",null,{\"children\":\"\u0026\u0026\"}],\" operator to render “\",[\"$r\",\"em\",null,{\"children\":\"(Importance: X)\"}],\"” in italics, but only for items that have non-zero importance. Your item list should end up looking like this:\"]}],[\"$r\",\"ul\",null,{\"children\":[\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"Space suit \",[\"$r\",\"em\",null,{\"children\":\"(Importance: 9)\"}]]}],\"\\n\",[\"$r\",\"li\",null,{\"children\":\"Helmet with a golden leaf\"}],\"\\n\",[\"$r\",\"li\",null,{\"children\":[\"Photo of Tam \",[\"$r\",\"em\",null,{\"children\":\"(Importance: 6)\"}]]}],\"\\n\"]}],[\"$r\",\"p\",null,{\"children\":\"Don’t forget to add a space between the two labels!\"}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, importance }) {\\n return (\\n \u003cli className=\\\"item\\\"\u003e\\n {name}\\n \u003c/li\u003e\\n );\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n importance={9} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n importance={0} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n importance={6} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"Solution\",null,{\"children\":[[\"$r\",\"p\",null,{\"children\":\"This should do the trick:\"}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Item({ name, importance }) {\\n return (\\n \u003cli className=\\\"item\\\"\u003e\\n {name}\\n {importance \u003e 0 \u0026\u0026 ' '}\\n {importance \u003e 0 \u0026\u0026\\n \u003ci\u003e(Importance: {importance})\u003c/i\u003e\\n }\\n \u003c/li\u003e\\n );\\n}\\n\\nexport default function PackingList() {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003eSally Ride's Packing List\u003c/h1\u003e\\n \u003cul\u003e\\n \u003cItem \\n importance={9} \\n name=\\\"Space suit\\\" \\n /\u003e\\n \u003cItem \\n importance={0} \\n name=\\\"Helmet with a golden leaf\\\" \\n /\u003e\\n \u003cItem \\n importance={6} \\n name=\\\"Photo of Tam\\\" \\n /\u003e\\n \u003c/ul\u003e\\n \u003c/section\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"p\",null,{\"children\":[\"Note that you must write \",[\"$r\",\"code\",null,{\"children\":\"importance \u003e 0 \u0026\u0026 ...\"}],\" rather than \",[\"$r\",\"code\",null,{\"children\":\"importance \u0026\u0026 ...\"}],\" so that if the \",[\"$r\",\"code\",null,{\"children\":\"importance\"}],\" is \",[\"$r\",\"code\",null,{\"children\":\"0\"}],\", \",[\"$r\",\"code\",null,{\"children\":\"0\"}],\" isn’t rendered as the result!\"]}],[\"$r\",\"p\",null,{\"children\":[\"In this solution, two separate conditions are used to insert a space between the name and the importance label. Alternatively, you could use a Fragment with a leading space: \",[\"$r\",\"code\",null,{\"children\":\"importance \u003e 0 \u0026\u0026 \u003c\u003e \u003ci\u003e...\u003c/i\u003e\u003c/\u003e\"}],\" or add a space immediately inside the \",[\"$r\",\"code\",null,{\"children\":\"\u003ci\u003e\"}],\": \",[\"$r\",\"code\",null,{\"children\":\"importance \u003e 0 \u0026\u0026 \u003ci\u003e ...\u003c/i\u003e\"}],\".\"]}]]}],[\"$r\",\"h4\",null,{\"id\":\"refactor-a-series-of---to-if-and-variables\",\"children\":[\"Refactor a series of \",[\"$r\",\"code\",null,{\"children\":\"? :\"}],\" to \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\" and variables \"]}],[\"$r\",\"p\",null,{\"children\":[\"This \",[\"$r\",\"code\",null,{\"children\":\"Drink\"}],\" component uses a series of \",[\"$r\",\"code\",null,{\"children\":\"? :\"}],\" conditions to show different information depending on whether the \",[\"$r\",\"code\",null,{\"children\":\"name\"}],\" prop is \",[\"$r\",\"code\",null,{\"children\":\"\\\"tea\\\"\"}],\" or \",[\"$r\",\"code\",null,{\"children\":\"\\\"coffee\\\"\"}],\". The problem is that the information about each drink is spread across multiple conditions. Refactor this code to use a single \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\" statement instead of three \",[\"$r\",\"code\",null,{\"children\":\"? :\"}],\" conditions.\"]}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Drink({ name }) {\\n return (\\n \u003csection\u003e\\n \u003ch1\u003e{name}\u003c/h1\u003e\\n \u003cdl\u003e\\n \u003cdt\u003ePart of plant\u003c/dt\u003e\\n \u003cdd\u003e{name === 'tea' ? 'leaf' : 'bean'}\u003c/dd\u003e\\n \u003cdt\u003eCaffeine content\u003c/dt\u003e\\n \u003cdd\u003e{name === 'tea' ? '15–70 mg/cup' : '80–185 mg/cup'}\u003c/dd\u003e\\n \u003cdt\u003eAge\u003c/dt\u003e\\n \u003cdd\u003e{name === 'tea' ? '4,000+ years' : '1,000+ years'}\u003c/dd\u003e\\n \u003c/dl\u003e\\n \u003c/section\u003e\\n );\\n}\\n\\nexport default function DrinkList() {\\n return (\\n \u003cdiv\u003e\\n \u003cDrink name=\\\"tea\\\" /\u003e\\n \u003cDrink name=\\\"coffee\\\" /\u003e\\n \u003c/div\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"p\",null,{\"children\":[\"Once you’ve refactored the code to use \",[\"$r\",\"code\",null,{\"children\":\"if\"}],\", do you have further ideas on how to simplify it?\"]}],[\"$r\",\"Solution\",null,{\"children\":[[\"$r\",\"p\",null,{\"children\":\"There are multiple ways you could go about this, but here is one starting point:\"}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"function Drink({ name }) {\\n let part, caffeine, age;\\n if (name === 'tea') {\\n part = 'leaf';\\n caffeine = '15–70 mg/cup';\\n age = '4,000+ years';\\n } else if (name === 'coffee') {\\n part = 'bean';\\n caffeine = '80–185 mg/cup';\\n age = '1,000+ years';\\n }\\n return (\\n \u003csection\u003e\\n \u003ch1\u003e{name}\u003c/h1\u003e\\n \u003cdl\u003e\\n \u003cdt\u003ePart of plant\u003c/dt\u003e\\n \u003cdd\u003e{part}\u003c/dd\u003e\\n \u003cdt\u003eCaffeine content\u003c/dt\u003e\\n \u003cdd\u003e{caffeine}\u003c/dd\u003e\\n \u003cdt\u003eAge\u003c/dt\u003e\\n \u003cdd\u003e{age}\u003c/dd\u003e\\n \u003c/dl\u003e\\n \u003c/section\u003e\\n );\\n}\\n\\nexport default function DrinkList() {\\n return (\\n \u003cdiv\u003e\\n \u003cDrink name=\\\"tea\\\" /\u003e\\n \u003cDrink name=\\\"coffee\\\" /\u003e\\n \u003c/div\u003e\\n );\\n}\\n\"}]}]}],[\"$r\",\"p\",null,{\"children\":\"Here the information about each drink is grouped together instead of being spread across multiple conditions. This makes it easier to add more drinks in the future.\"}],[\"$r\",\"p\",null,{\"children\":\"Another solution would be to remove the condition altogether by moving the information into objects:\"}],[\"$r\",\"Sandpack\",null,{\"children\":[\"$r\",\"pre\",null,{\"children\":[\"$r\",\"code\",null,{\"className\":\"language-js\",\"children\":\"const drinks = {\\n tea: {\\n part: 'leaf',\\n caffeine: '15–70 mg/cup',\\n age: '4,000+ years'\\n },\\n coffee: {\\n part: 'bean',\\n caffeine: '80–185 mg/cup',\\n age: '1,000+ years'\\n }\\n};\\n\\nfunction Drink({ name }) {\\n const info = drinks[name];\\n return (\\n \u003csection\u003e\\n \u003ch1\u003e{name}\u003c/h1\u003e\\n \u003cdl\u003e\\n \u003cdt\u003ePart of plant\u003c/dt\u003e\\n \u003cdd\u003e{info.part}\u003c/dd\u003e\\n \u003cdt\u003eCaffeine content\u003c/dt\u003e\\n \u003cdd\u003e{info.caffeine}\u003c/dd\u003e\\n \u003cdt\u003eAge\u003c/dt\u003e\\n \u003cdd\u003e{info.age}\u003c/dd\u003e\\n \u003c/dl\u003e\\n \u003c/section\u003e\\n );\\n}\\n\\nexport default function DrinkList() {\\n return (\\n \u003cdiv\u003e\\n \u003cDrink name=\\\"tea\\\" /\u003e\\n \u003cDrink name=\\\"coffee\\\" /\u003e\\n \u003c/div\u003e\\n );\\n}\\n\"}]}]}]]}]]}]]","meta":{"title":"Conditional Rendering"},"languages":null},"__N_SSG":true},"page":"/[[...markdownPath]]","query":{"markdownPath":["learn","conditional-rendering"]},"buildId":"m2LJ0LbG14QRgxhjlJy1b","isFallback":false,"gsp":true,"scriptLoader":[]}</script></body></html>