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"></path><polygon fill="currentColor" points=" 45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8, 14.9 62.8,22.9 71.5,22.9 "></polygon></svg></a></div></div></div></header><div class="css-xbsqlp css-15lkjjo"><div class="css-1m1176 css-95xunl"><div class="css-12vsfho"><div class="css-tctv7l"><div class="css-10335ra"><article class="css-174qq1k"><header class="css-hgc6lu"><h1 class="css-1obw60b">Composition vs Inheritance</h1></header><div class="css-124oy3v"><div class="css-6nf64v"><div class="scary"> <blockquote> <p>These docs are old and won’t be updated. Go to <a href="https://react.dev/" target="_blank" rel="nofollow noopener noreferrer">react.dev</a> for the new React docs.</p> </blockquote> </div> <p>React has a powerful composition model, and we recommend using composition instead of inheritance to reuse code between components.</p> <p>In this section, we will consider a few problems where developers new to React often reach for inheritance, and show how we can solve them with composition.</p> <h2 id="containment"><a href="#containment" aria-hidden class="anchor"><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Containment </h2> <p>Some components don’t know their children ahead of time. This is especially common for components like <code class="gatsby-code-text">Sidebar</code> or <code class="gatsby-code-text">Dialog</code> that represent generic “boxes”.</p> <p>We recommend that such components use the special <code class="gatsby-code-text">children</code> prop to pass children elements directly into their output:</p> <div class="gatsby-highlight has-highlighted-lines" data-language="jsx"><pre class="gatsby-code-jsx"><code class="gatsby-code-jsx"><span class="token keyword">function</span> <span class="token function">FancyBorder</span><span class="token punctuation">(</span><span class="token parameter">props</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">(</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">className</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token string">'FancyBorder FancyBorder-'</span> <span class="token operator">+</span> props<span class="token punctuation">.</span>color<span class="token punctuation">}</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token punctuation">{</span>props<span class="token punctuation">.</span>children<span class="token punctuation">}</span><span class="token plain-text"></span></span><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span> <span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span></code></pre></div> <p>This lets other components pass arbitrary children to them by nesting the JSX:</p> <div class="gatsby-highlight has-highlighted-lines" data-language="jsx"><pre class="gatsby-code-jsx"><code class="gatsby-code-jsx"><span class="token keyword">function</span> <span class="token function">WelcomeDialog</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">(</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">FancyBorder</span></span> <span class="token attr-name">color</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>blue<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Dialog-title<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span></span><span class="gatsby-highlight-code-line"><span class="token plain-text"> Welcome</span></span><span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">></span></span><span class="token plain-text"></span></span><span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Dialog-message<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span></span><span class="gatsby-highlight-code-line"><span class="token plain-text"> Thank you for visiting our spacecraft!</span></span><span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">></span></span><span class="token plain-text"></span></span><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span><span class="token class-name">FancyBorder</span></span><span class="token punctuation">></span></span> <span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span></code></pre></div> <p><strong><a href="https://codepen.io/gaearon/pen/ozqNOV?editors=0010" target="_blank" rel="nofollow noopener noreferrer">Try it on CodePen</a></strong></p> <p>Anything inside the <code class="gatsby-code-text">&lt;FancyBorder></code> JSX tag gets passed into the <code class="gatsby-code-text">FancyBorder</code> component as a <code class="gatsby-code-text">children</code> prop. Since <code class="gatsby-code-text">FancyBorder</code> renders <code class="gatsby-code-text">{props.children}</code> inside a <code class="gatsby-code-text">&lt;div></code>, the passed elements appear in the final output.</p> <p>While this is less common, sometimes you might need multiple “holes” in a component. In such cases you may come up with your own convention instead of using <code class="gatsby-code-text">children</code>:</p> <div class="gatsby-highlight has-highlighted-lines" data-language="jsx"><pre class="gatsby-code-jsx"><code class="gatsby-code-jsx"><span class="token keyword">function</span> <span class="token function">SplitPane</span><span class="token punctuation">(</span><span class="token parameter">props</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">(</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>SplitPane<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>SplitPane-left<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token punctuation">{</span>props<span class="token punctuation">.</span>left<span class="token punctuation">}</span><span class="token plain-text"></span></span><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>SplitPane-right<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token punctuation">{</span>props<span class="token punctuation">.</span>right<span class="token punctuation">}</span><span class="token plain-text"></span></span><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span> <span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token keyword">function</span> <span class="token function">App</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">(</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">SplitPane</span></span> <span class="token attr-name">left</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span> <span class="gatsby-highlight-code-line"> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">Contacts</span></span> <span class="token punctuation">/></span></span></span> <span class="token punctuation">}</span></span> <span class="token attr-name">right</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span> <span class="gatsby-highlight-code-line"> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">Chat</span></span> <span class="token punctuation">/></span></span></span> <span class="token punctuation">}</span></span> <span class="token punctuation">/></span></span> <span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span></code></pre></div> <p><a href="https://codepen.io/gaearon/pen/gwZOJp?editors=0010" target="_blank" rel="nofollow noopener noreferrer"><strong>Try it on CodePen</strong></a></p> <p>React elements like <code class="gatsby-code-text">&lt;Contacts /></code> and <code class="gatsby-code-text">&lt;Chat /></code> are just objects, so you can pass them as props like any other data. This approach may remind you of “slots” in other libraries but there are no limitations on what you can pass as props in React.</p> <h2 id="specialization"><a href="#specialization" aria-hidden class="anchor"><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Specialization </h2> <p>Sometimes we think about components as being “special cases” of other components. For example, we might say that a <code class="gatsby-code-text">WelcomeDialog</code> is a special case of <code class="gatsby-code-text">Dialog</code>.</p> <p>In React, this is also achieved by composition, where a more “specific” component renders a more “generic” one and configures it with props:</p> <div class="gatsby-highlight has-highlighted-lines" data-language="jsx"><pre class="gatsby-code-jsx"><code class="gatsby-code-jsx"><span class="token keyword">function</span> <span class="token function">Dialog</span><span class="token punctuation">(</span><span class="token parameter">props</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">(</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">FancyBorder</span></span> <span class="token attr-name">color</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>blue<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Dialog-title<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token punctuation">{</span>props<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token plain-text"></span></span><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Dialog-message<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token punctuation">{</span>props<span class="token punctuation">.</span>message<span class="token punctuation">}</span><span class="token plain-text"></span></span><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span><span class="token class-name">FancyBorder</span></span><span class="token punctuation">></span></span> <span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token keyword">function</span> <span class="token function">WelcomeDialog</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">(</span> <span class="gatsby-highlight-code-line"> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">Dialog</span></span></span><span class="gatsby-highlight-code-line"> <span class="token attr-name">title</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Welcome<span class="token punctuation">"</span></span></span><span class="gatsby-highlight-code-line"> <span class="token attr-name">message</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Thank you for visiting our spacecraft!<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span></span> <span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span></code></pre></div> <p><a href="https://codepen.io/gaearon/pen/kkEaOZ?editors=0010" target="_blank" rel="nofollow noopener noreferrer"><strong>Try it on CodePen</strong></a></p> <p>Composition works equally well for components defined as classes:</p> <div class="gatsby-highlight has-highlighted-lines" data-language="jsx"><pre class="gatsby-code-jsx"><code class="gatsby-code-jsx"><span class="token keyword">function</span> <span class="token function">Dialog</span><span class="token punctuation">(</span><span class="token parameter">props</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">(</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">FancyBorder</span></span> <span class="token attr-name">color</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>blue<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Dialog-title<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token punctuation">{</span>props<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span> <span class="token attr-name">className</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Dialog-message<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token punctuation">{</span>props<span class="token punctuation">.</span>message<span class="token punctuation">}</span><span class="token plain-text"></span> <span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token punctuation">{</span>props<span class="token punctuation">.</span>children<span class="token punctuation">}</span><span class="token plain-text"></span></span><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span><span class="token class-name">FancyBorder</span></span><span class="token punctuation">></span></span> <span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token keyword">class</span> <span class="token class-name">SignUpDialog</span> <span class="token keyword">extends</span> <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span> <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">props</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">super</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>handleChange <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">handleChange</span><span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>handleSignUp <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">handleSignUp</span><span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token literal-property property">login</span><span class="token operator">:</span> <span class="token string">''</span><span class="token punctuation">}</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token punctuation">(</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">Dialog</span></span> <span class="token attr-name">title</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>Mars Exploration Program<span class="token punctuation">"</span></span> <span class="token attr-name">message</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>How should we refer to you?<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span> <span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">value</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>login<span class="token punctuation">}</span></span></span><span class="gatsby-highlight-code-line"> <span class="token attr-name">onChange</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>handleChange<span class="token punctuation">}</span></span> <span class="token punctuation">/></span></span><span class="token plain-text"></span></span><span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">onClick</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>handleSignUp<span class="token punctuation">}</span></span><span class="token punctuation">></span></span><span class="token plain-text"></span></span><span class="gatsby-highlight-code-line"><span class="token plain-text"> Sign Me Up!</span></span><span class="gatsby-highlight-code-line"><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">></span></span><span class="token plain-text"></span></span><span class="token plain-text"> </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span><span class="token class-name">Dialog</span></span><span class="token punctuation">></span></span> <span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token function">handleChange</span><span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token literal-property property">login</span><span class="token operator">:</span> e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>value<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token function">handleSignUp</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">alert</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Welcome aboard, </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>login<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">!</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span></code></pre></div> <p><a href="https://codepen.io/gaearon/pen/gwZbYa?editors=0010" target="_blank" rel="nofollow noopener noreferrer"><strong>Try it on CodePen</strong></a></p> <h2 id="so-what-about-inheritance"><a href="#so-what-about-inheritance" aria-hidden class="anchor"><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>So What About Inheritance? </h2> <p>At Facebook, we use React in thousands of components, and we haven’t found any use cases where we would recommend creating component inheritance hierarchies.</p> <p>Props and composition give you all the flexibility you need to customize a component’s look and behavior in an explicit and safe way. Remember that components may accept arbitrary props, including primitive values, React elements, or functions.</p> <p>If you want to reuse non-UI functionality between components, we suggest extracting it into a separate JavaScript module. 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