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v0.4.0
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Paul O’Shannessy
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
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<title>React | Why React?</title>
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<meta property="og:title" content="React | Why React?" />
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<meta property="og:description" content="A JavaScript library for building user interfaces" />
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<a class="nav-home" href="/react/index.html">
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<img class="nav-logo" alt="" src="/react/img/logo_small.png" width="38" height="38">
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React
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<li><a href="/react/docs/getting-started.html" class="active">docs</a></li>
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<li><a href="/react/downloads.html">download</a></li>
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<li><a href="/react/blog/">blog</a></li>
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<li><a href="http://github.com/facebook/react">github</a>
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<section class="content wrap documentationContent">
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<div class="nav-docs">
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<div class="nav-docs-section">
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<h3>Quick Start</h3>
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<ul>
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<li>
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<a href="/react/docs/getting-started.html">
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Getting Started
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</a>
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<a href="/react/docs/tutorial.html">
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Tutorial
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<div class="nav-docs-section">
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<h3>Guides</h3>
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<ul>
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<li>
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<a href="/react/docs/why-react.html" class="active">
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Why React?
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</a>
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</li>
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<li>
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<a href="/react/docs/displaying-data.html">
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Displaying Data
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</a>
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<ul>
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<li>
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<a href="/react/docs/jsx-in-depth.html">
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JSX in Depth
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</a>
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</li>
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<li>
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<a href="/react/docs/jsx-gotchas.html">
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JSX Gotchas
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</a>
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</ul>
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</li>
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<li>
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<a href="/react/docs/interactivity-and-dynamic-uis.html">
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Interactivity and Dynamic UIs
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</a>
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</li>
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<li>
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<a href="/react/docs/multiple-components.html">
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Multiple Components
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</a>
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</li>
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<li>
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<a href="/react/docs/reusable-components.html">
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Reusable Components
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</a>
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</li>
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<li>
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<a href="/react/docs/forms.html">
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Forms
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</a>
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</li>
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<li>
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<a href="/react/docs/working-with-the-browser.html">
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Working With the Browser
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</a>
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<ul>
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<li>
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<a href="/react/docs/more-about-refs.html">
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More About Refs
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</a>
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</li>
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</ul>
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</li>
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<li>
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<a href="/react/docs/tooling-integration.html">
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Tooling integration
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</a>
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</li>
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<li>
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<a href="/react/docs/reference.html">
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Reference
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</a>
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</li>
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</ul>
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</div>
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</div>
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<div class="inner-content">
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<h1>Why React?</h1>
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<div class="subHeader"></div>
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<p>React is a JavaScript library for creating user interfaces by Facebook and Instagram. Many people choose to think of React as the <strong>V</strong> in <strong><a href="http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller">MVC</a></strong>.</p>
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<p>We built React to solve one problem: <strong>building large applications with data that changes over time</strong>. To do this, React uses two main ideas.</p>
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<h3>Simple</h3>
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<p>Simply express how your app should look at any given point in time, and React will automatically manage all UI updates when your underlying data changes.</p>
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<h3>Declarative</h3>
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<p>When the data changes, React conceptually hits the "refresh" button, and knows to only update the changed parts.</p>
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<h2>Build Composable Components</h2>
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<p>React is all about building reusable components. In fact, with React the <em>only</em> thing you do is build components. Since they're so encapsulated, components make code reuse, testing, and separation of concerns easy.</p>
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<h2>Give It Five Minutes</h2>
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<p>React challenges a lot of conventional wisdom, and at first glance some of the ideas may seem crazy. <a href="http://37signals.com/svn/posts/3124-give-it-five-minutes">Give it five minutes</a> while reading this guide; those crazy ideas have worked for building thousands of components both inside and outside of Facebook and Instagram.</p>
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<h2>Learn More</h2>
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<p>You can learn more about our motivations behind building React in <a href="http://facebook.github.io/react/blog/2013/06/05/why-react.html">this blog post</a>.</p>
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<div class="docs-prevnext">
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<a class="docs-next" href="/react/docs/displaying-data.html">Next →</a>
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</div>
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<div class="fb-comments" data-width="650" data-num-posts="10" data-href="http://facebook.github.io/react/docs/why-react.html"></div>
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</div>
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</section>
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<footer class="wrap">
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<div class="left">A Facebook & Instagram collaboration.</div>
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<div class="right">© 2013 Facebook Inc.</div>
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