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href="/support/security.html">Security</a> </li> </ul> </li> <li class="nav-item"> <div class="link-container"> <a href="/install/">Install</a> </div> </li> </ul> </nav> </header> <main role="main"> <article class="page-wide"> <div class="callout"> <h1 class="preamble">Swift is a <strong>general-purpose</strong> programming language that’s <strong>approachable</strong> for newcomers and <strong>powerful</strong> for experts. <span>It is <strong>fast</strong>, <strong>modern</strong>, <strong>safe</strong>, and a <strong>joy</strong> to write.</span></h1> <div class="language-swift featured-snippet visible highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">struct</span> <span class="kt">Binomial</span><span class="p">:</span> <span class="kt">Codable</span> <span class="p">{</span> <span class="k">var</span> <span class="nv">genus</span><span class="p">:</span> <span class="kt">String</span> <span class="k">var</span> <span class="nv">species</span><span class="p">:</span> <span class="kt">String</span> <span class="k">var</span> <span class="nv">subspecies</span><span class="p">:</span> <span class="kt">String</span><span class="p">?</span> <span class="p">}</span> <span class="k">let</span> <span class="nv">tree</span> <span class="o">=</span> <span class="kt">Binomial</span><span class="p">(</span><span class="nv">genus</span><span class="p">:</span> <span class="s">"Pin"</span><span class="p">,</span> <span class="nv">species</span><span class="p">:</span> <span class="s">"oak"</span><span class="p">)</span> <span class="k">let</span> <span class="nv">jsonData</span> <span class="o">=</span> <span class="k">try</span> <span class="kt">JSONEncoder</span><span class="p">()</span><span class="o">.</span><span class="nf">encode</span><span class="p">(</span><span class="n">tree</span><span class="p">)</span> <span class="c1">// {"genus":"Pin","species":"oak"}</span> </code></pre></div> </div> <div class="language-swift featured-snippet highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">struct</span> <span class="kt">ScientificName</span> <span class="p">{</span> <span class="k">var</span> <span class="nv">genus</span><span class="p">:</span> <span class="kt">String</span> <span class="k">var</span> <span class="nv">species</span><span class="p">:</span> <span class="kt">String</span> <span class="k">var</span> <span class="nv">subspecies</span><span class="p">:</span> <span class="kt">String</span><span class="p">?</span> <span class="k">var</span> <span class="nv">description</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">var</span> <span class="nv">text</span> <span class="o">=</span> <span class="s">"</span><span class="se">\(</span><span class="n">genus</span><span class="se">)</span><span class="s"> </span><span class="se">\(</span><span class="n">species</span><span class="se">)</span><span class="s">"</span> <span class="k">if</span> <span class="k">let</span> <span class="nv">subspecies</span> <span class="p">{</span> <span class="c1">// subspecies guaranteed to be non-nil</span> <span class="n">text</span> <span class="o">+=</span> <span class="s">"subsp. </span><span class="se">\(</span><span class="n">subspecies</span><span class="se">)</span><span class="s">"</span> <span class="p">}</span> <span class="k">return</span> <span class="n">text</span> <span class="p">}</span> <span class="p">}</span> </code></pre></div> </div> <div class="language-swift featured-snippet highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">let</span> <span class="nv">hello</span> <span class="o">=</span> <span class="s">"Hello, world!"</span> <span class="k">let</span> <span class="nv">multilineString</span> <span class="o">=</span> <span class="s">""" @@@ @@ @@@@ @@ @@@ @@@@@ @@@@@@@@@ @@@@@ @@@@@@@@@@ @@@@@@ @@@@@@@@@@ @@@@@@ @@@@@@@@@@@@@@@@@ @ @@@@@@@@@@@@@@@ @@@@@@ @@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@ @ </span><span class="se">\(</span><span class="n">hello</span><span class="se">)</span><span class="s"> """</span> </code></pre></div> </div> </div> <div class="banner primary"> <p>Get ready for the Swift 6 language mode with the <a href="https://www.swift.org/migration/">official migration guide</a></p> </div> <div class="link-grid"> <ul> <li> <a href="/install"> <div class="flex-container"> <div class="latest-release-container"> <span> 6.0.2 </span> </div> Latest release </div> </a> </li> <li> <a href="/getting-started"> <img src="/assets/images/landing-page/signs.svg" /> Get started </a> </li> <li> <a href="/documentation"> <img src="/assets/images/landing-page/book.svg" /> Read the docs </a> </li> <li> <a href="/packages"> <img src="/assets/images/landing-page/box.svg" /> Explore packages </a> </li> </ul> </div> <h2 id="use-cases" class="header-with-anchor">Use Cases <a title="Permalink for Use Cases section" href="#use-cases"> <?xml version="1.0" encoding="utf-8"?> <svg width="24px" height="24px" viewBox="0 0 14 14" role="img" focusable="false" aria-hidden="true" xmlns="http://www.w3.org/2000/svg"><path d="m 11.58824,9.823529 q 0,-0.294117 -0.20589,-0.499999 L 9.85294,7.794118 q -0.20588,-0.205883 -0.5,-0.205883 -0.30882,0 -0.52941,0.235295 0.0221,0.02206 0.13971,0.136029 0.11764,0.113971 0.15808,0.158088 0.0404,0.04412 0.1103,0.139706 0.0698,0.09559 0.0956,0.1875 0.0257,0.09191 0.0257,0.202206 0,0.294117 -0.20588,0.5 -0.20588,0.205882 -0.5,0.205882 -0.1103,0 -0.20221,-0.02573 Q 8.35293,9.301471 8.25733,9.231621 8.16173,9.161771 8.11763,9.121327 8.07353,9.080887 7.95954,8.963238 7.84557,8.845591 7.82351,8.823533 7.58086,9.051474 7.58086,9.360297 q 0,0.294118 0.20588,0.5 l 1.51471,1.522059 q 0.19853,0.19853 0.5,0.19853 0.29412,0 0.5,-0.191177 l 1.08088,-1.073529 q 0.20589,-0.205883 0.20589,-0.492648 z M 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Swift code is safe by design and produces software that runs lightning-fast. <br /><br /> SwiftArgumentParser and Swift's growing package ecosystem make developing cross-platform command-line tools a breeze. </p> <a href="/getting-started/cli-swiftpm" class="cta-secondary">Learn more</a> </li> <li class="grid-level-1"> <h3>Server and Networking</h3> <p> Swift's small memory footprint, quick startup time, and deterministic performance make it a great choice for server and other networked applications. <br /><br /> SwiftNIO and Swift's dynamic server ecosystem bring joy to developing networked applications. </p> <a href="/documentation/server" class="cta-secondary">Learn more</a> </li> </ul> <h2 id="getting-involved" class="header-with-anchor">Getting Involved <a title="Permalink for Getting Involved section" href="#getting-involved"> <?xml version="1.0" encoding="utf-8"?> <svg width="24px" height="24px" viewBox="0 0 14 14" role="img" focusable="false" aria-hidden="true" xmlns="http://www.w3.org/2000/svg"><path d="m 11.58824,9.823529 q 0,-0.294117 -0.20589,-0.499999 L 9.85294,7.794118 q -0.20588,-0.205883 -0.5,-0.205883 -0.30882,0 -0.52941,0.235295 0.0221,0.02206 0.13971,0.136029 0.11764,0.113971 0.15808,0.158088 0.0404,0.04412 0.1103,0.139706 0.0698,0.09559 0.0956,0.1875 0.0257,0.09191 0.0257,0.202206 0,0.294117 -0.20588,0.5 -0.20588,0.205882 -0.5,0.205882 -0.1103,0 -0.20221,-0.02573 Q 8.35293,9.301471 8.25733,9.231621 8.16173,9.161771 8.11763,9.121327 8.07353,9.080887 7.95954,8.963238 7.84557,8.845591 7.82351,8.823533 7.58086,9.051474 7.58086,9.360297 q 0,0.294118 0.20588,0.5 l 1.51471,1.522059 q 0.19853,0.19853 0.5,0.19853 0.29412,0 0.5,-0.191177 l 1.08088,-1.073529 q 0.20589,-0.205883 0.20589,-0.492648 z M 6.41912,4.639706 q 0,-0.294118 -0.20588,-0.5 L 4.69853,2.617647 q -0.20588,-0.205882 -0.5,-0.205882 -0.28677,0 -0.5,0.198529 L 2.61765,3.683823 q -0.20589,0.205883 -0.20589,0.492648 0,0.294117 0.20589,0.499999 l 1.52941,1.529412 q 0.19853,0.19853 0.5,0.19853 0.30882,0 0.52941,-0.227942 Q 5.15437,6.15441 5.03676,6.040441 4.91912,5.92647 4.87868,5.882353 4.83828,5.838233 4.76838,5.742647 q -0.0698,-0.09559 -0.0956,-0.1875 -0.0257,-0.09191 -0.0257,-0.202206 0,-0.294117 0.20588,-0.5 0.20588,-0.205882 0.5,-0.205882 0.1103,0 0.20221,0.02573 0.0919,0.02573 0.1875,0.09559 0.0956,0.06985 0.1397,0.110294 0.0441,0.04044 0.15809,0.158089 Q 6.15443,5.154409 6.17649,5.176467 6.41914,4.948526 6.41914,4.639703 z M 13,9.823529 q 0,0.882353 -0.625,1.492647 l -1.08088,1.07353 Q 10.68382,13 9.80147,13 q -0.88971,0 -1.5,-0.625 L 6.78676,10.852941 Q 6.17647,10.242647 6.17647,9.360294 q 0,-0.904412 0.64706,-1.536764 L 6.17647,7.176471 Q 5.54412,7.82353 4.64706,7.82353 q -0.88235,0 -1.5,-0.617648 L 1.617647,5.676471 Q 1,5.058824 1,4.176471 1,3.294118 1.625,2.683824 L 2.70588,1.610294 Q 3.31618,1 4.19853,1 q 0.88971,0 1.5,0.625 l 1.51471,1.522059 q 0.61029,0.610294 0.61029,1.492647 0,0.904412 -0.64706,1.536764 L 7.82353,6.823529 Q 8.45588,6.17647 9.35294,6.17647 q 0.88235,0 1.5,0.617648 l 1.52941,1.529411 Q 13,8.941176 13,9.823529 z"/></svg> </a></h2> <p>Everyone is welcome to contribute to Swift. Contributing doesn’t just mean writing code or submitting pull request — there are many different ways for you to get involved, including answering questions on the forums, reporting or triaging bugs, and participating in the Swift evolution process.</p> <p>No matter how you want to get involved, we ask that you first learn what’s expected of anyone who participates in the project by reading the <a href="/community/">Community Overview</a>. If you’re contributing code, you should also know how to build and run Swift from the repository, as described in <a href="/documentation/source-code/">Source Code</a>.</p> <ul class="grid-level-0 grid-layout-3-column"> <li class="grid-level-1"> <h3>Design</h3> <p> Help shape the future of Swift by participating in <em>the Swift evolution process</em>. </p> <a href="/contributing/#swift-evolution" class="cta-secondary">Learn more</a> </li> <li class="grid-level-1"> <h3>Code</h3> <p> Contribute to the Swift compiler, standard library, and other core components of the project. </p> <a href="/contributing/#contributing-code" class="cta-secondary">Learn more</a> </li> <li class="grid-level-1"> <h3>Troubleshoot</h3> <p> Help improve the quality of Swift by reporting and triaging bugs. </p> <a href="/contributing/#triaging-bugs" class="cta-secondary">Learn more</a> </li> </ul> <h2 id="whats-new" class="header-with-anchor">What’s New <a title="Permalink for What’s New section" href="#whats-new"> <?xml version="1.0" encoding="utf-8"?> <svg width="24px" height="24px" viewBox="0 0 14 14" role="img" focusable="false" aria-hidden="true" xmlns="http://www.w3.org/2000/svg"><path d="m 11.58824,9.823529 q 0,-0.294117 -0.20589,-0.499999 L 9.85294,7.794118 q -0.20588,-0.205883 -0.5,-0.205883 -0.30882,0 -0.52941,0.235295 0.0221,0.02206 0.13971,0.136029 0.11764,0.113971 0.15808,0.158088 0.0404,0.04412 0.1103,0.139706 0.0698,0.09559 0.0956,0.1875 0.0257,0.09191 0.0257,0.202206 0,0.294117 -0.20588,0.5 -0.20588,0.205882 -0.5,0.205882 -0.1103,0 -0.20221,-0.02573 Q 8.35293,9.301471 8.25733,9.231621 8.16173,9.161771 8.11763,9.121327 8.07353,9.080887 7.95954,8.963238 7.84557,8.845591 7.82351,8.823533 7.58086,9.051474 7.58086,9.360297 q 0,0.294118 0.20588,0.5 l 1.51471,1.522059 q 0.19853,0.19853 0.5,0.19853 0.29412,0 0.5,-0.191177 l 1.08088,-1.073529 q 0.20589,-0.205883 0.20589,-0.492648 z M 6.41912,4.639706 q 0,-0.294118 -0.20588,-0.5 L 4.69853,2.617647 q -0.20588,-0.205882 -0.5,-0.205882 -0.28677,0 -0.5,0.198529 L 2.61765,3.683823 q -0.20589,0.205883 -0.20589,0.492648 0,0.294117 0.20589,0.499999 l 1.52941,1.529412 q 0.19853,0.19853 0.5,0.19853 0.30882,0 0.52941,-0.227942 Q 5.15437,6.15441 5.03676,6.040441 4.91912,5.92647 4.87868,5.882353 4.83828,5.838233 4.76838,5.742647 q -0.0698,-0.09559 -0.0956,-0.1875 -0.0257,-0.09191 -0.0257,-0.202206 0,-0.294117 0.20588,-0.5 0.20588,-0.205882 0.5,-0.205882 0.1103,0 0.20221,0.02573 0.0919,0.02573 0.1875,0.09559 0.0956,0.06985 0.1397,0.110294 0.0441,0.04044 0.15809,0.158089 Q 6.15443,5.154409 6.17649,5.176467 6.41914,4.948526 6.41914,4.639703 z M 13,9.823529 q 0,0.882353 -0.625,1.492647 l -1.08088,1.07353 Q 10.68382,13 9.80147,13 q -0.88971,0 -1.5,-0.625 L 6.78676,10.852941 Q 6.17647,10.242647 6.17647,9.360294 q 0,-0.904412 0.64706,-1.536764 L 6.17647,7.176471 Q 5.54412,7.82353 4.64706,7.82353 q -0.88235,0 -1.5,-0.617648 L 1.617647,5.676471 Q 1,5.058824 1,4.176471 1,3.294118 1.625,2.683824 L 2.70588,1.610294 Q 3.31618,1 4.19853,1 q 0.88971,0 1.5,0.625 l 1.51471,1.522059 q 0.61029,0.610294 0.61029,1.492647 0,0.904412 -0.64706,1.536764 L 7.82353,6.823529 Q 8.45588,6.17647 9.35294,6.17647 q 0.88235,0 1.5,0.617648 l 1.52941,1.529411 Q 13,8.941176 13,9.823529 z"/></svg> </a></h2> <p>Stay up-to-date with the latest in the Swift community.</p> <div class="links links-list-nostyle"> <ul> <li><a href="/blog/">Visit the Swift.org blog</a></li> <li><a href="https://forums.swift.org">Visit the Swift forums</a></li> <li><a href="https://twitter.com/swiftlang" target="_blank" class="link-external">Follow @swiftlang on X (formerly Twitter)</a></li> </ul> </div> <script> var featuredSnippets = document.querySelectorAll('.featured-snippet'); var visibleSnippet = document.querySelector('.featured-snippet.visible'); var randomIndex = Math.floor(Math.random() * featuredSnippets.length); visibleSnippet?.classList.remove('visible'); featuredSnippets[randomIndex]?.classList.add('visible'); </script> </article> </main> <footer role="contentinfo"> <div class="footer-content"> <p class="copyright">Copyright © 2024 Apple Inc. 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