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Updated docs for 0.34
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Héctor Ramos
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@@ -10,7 +10,7 @@ class <span class="token class-name">HelloWorldApp</span> extends <span class="t
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AppRegistry<span class="token punctuation">.</span><span class="token function">registerComponent<span class="token punctuation">(</span></span><span class="token string">'HelloWorldApp'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> HelloWorldApp<span class="token punctuation">)</span><span class="token punctuation">;</span></div><iframe style="margin-top:4px;" width="880" height="420" data-src="//npmcdn.com/react-native-web-player@1.1.0/index.html#code=import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20AppRegistry%2C%20Text%20%7D%20from%20'react-native'%3B%0A%0Aclass%20HelloWorldApp%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CText%3EHello%20world!%3C%2FText%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0AAppRegistry.registerComponent('HelloWorldApp'%2C%20()%20%3D%3E%20HelloWorldApp)%3B" frameborder="0"></iframe></div><p>If you are feeling curious, you can play around with sample code directly in the web simulators. You can also paste it into your <code>index.ios.js</code> or <code>index.android.js</code> file to create a real app on your local machine.</p><h2><a class="anchor" name="what-s-going-on-here"></a>What's going on here? <a class="hash-link" href="docs/tutorial.html#what-s-going-on-here">#</a></h2><p>Some of the things in here might not look like JavaScript to you. Don't panic. This is the future.</p><p>First of all, ES2015 (also known as ES6) is a set of improvements to JavaScript that is now part of the official standard, but not yet supported by all browsers, so often it isn't used yet in web development. React Native ships with ES2015 support, so you can use this stuff without worrying about compatibility. <code>import</code>, <code>from</code>, <code>class</code>, <code>extends</code>, and the <code>() =></code> syntax in the example above are all ES2015 features. If you aren't familiar with ES2015, you can probably pick it up just by reading through sample code like this tutorial has. If you want, <a href="https://babeljs.io/docs/learn-es2015/" target="_blank">this page</a> has a good overview of ES2015 features.</p><p>The other unusual thing in this code example is <code><Text>Hello world!</Text></code>. This is JSX - a syntax for embedding XML within JavaScript. Many frameworks use a special templating language which lets you embed code inside markup language. In React, this is reversed. JSX lets you write your markup language inside code. It looks like HTML on the web, except instead of web things like <code><div></code> or <code><span></code>, you use React components. In this case, <code><Text></code>
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AppRegistry<span class="token punctuation">.</span><span class="token function">registerComponent<span class="token punctuation">(</span></span><span class="token string">'HelloWorldApp'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> HelloWorldApp<span class="token punctuation">)</span><span class="token punctuation">;</span></div><iframe style="margin-top:4px;" width="880" height="420" data-src="//cdn.rawgit.com/dabbott/react-native-web-player/gh-v1.2.4/index.html#code=import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20AppRegistry%2C%20Text%20%7D%20from%20'react-native'%3B%0A%0Aclass%20HelloWorldApp%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CText%3EHello%20world!%3C%2FText%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0AAppRegistry.registerComponent('HelloWorldApp'%2C%20()%20%3D%3E%20HelloWorldApp)%3B" frameborder="0"></iframe></div><p>If you are feeling curious, you can play around with sample code directly in the web simulators. You can also paste it into your <code>index.ios.js</code> or <code>index.android.js</code> file to create a real app on your local machine.</p><h2><a class="anchor" name="what-s-going-on-here"></a>What's going on here? <a class="hash-link" href="docs/tutorial.html#what-s-going-on-here">#</a></h2><p>Some of the things in here might not look like JavaScript to you. Don't panic. This is the future.</p><p>First of all, ES2015 (also known as ES6) is a set of improvements to JavaScript that is now part of the official standard, but not yet supported by all browsers, so often it isn't used yet in web development. React Native ships with ES2015 support, so you can use this stuff without worrying about compatibility. <code>import</code>, <code>from</code>, <code>class</code>, <code>extends</code>, and the <code>() =></code> syntax in the example above are all ES2015 features. If you aren't familiar with ES2015, you can probably pick it up just by reading through sample code like this tutorial has. If you want, <a href="https://babeljs.io/docs/learn-es2015/" target="_blank">this page</a> has a good overview of ES2015 features.</p><p>The other unusual thing in this code example is <code><Text>Hello world!</Text></code>. This is JSX - a syntax for embedding XML within JavaScript. Many frameworks use a special templating language which lets you embed code inside markup language. In React, this is reversed. JSX lets you write your markup language inside code. It looks like HTML on the web, except instead of web things like <code><div></code> or <code><span></code>, you use React components. In this case, <code><Text></code>
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is a built-in component that just displays some text.</p><h2><a class="anchor" name="component-and-appregistry"></a>Component and AppRegistry <a class="hash-link" href="docs/tutorial.html#component-and-appregistry">#</a></h2><p>So this code is defining <code>HelloWorldApp</code>, a new <code>Component</code>, and it's registering it with the <code>AppRegistry</code>. When you're building a React Native app, you'll be making new components a lot. Anything you see on the screen is some sort of component. A component can be pretty simple - the only thing that's required is a <code>render</code> function which returns some JSX to render.</p><p>The <code>AppRegistry</code> just tells React Native which component is the root one for the whole application. You won't be thinking about <code>AppRegistry</code> a lot - there will probably just be one call to <code>AppRegistry.registerComponent</code> in your whole app. It's included in these examples so you can paste the whole thing into your <code>index.ios.js</code> or <code>index.android.js</code> file and get it running.</p><h2><a class="anchor" name="this-app-doesn-t-do-very-much"></a>This App Doesn't Do Very Much <a class="hash-link" href="docs/tutorial.html#this-app-doesn-t-do-very-much">#</a></h2><p>Good point. To make components do more interesting things, you need to <a href="/react-native/docs/props.html" target="">learn about Props</a>.</p></div><div class="docs-prevnext"><a class="docs-prev" href="docs/getting-started.html#content">← Prev</a><a class="docs-next" href="docs/props.html#content">Next →</a></div><p class="edit-page-block">You can <a target="_blank" href="https://github.com/facebook/react-native/blob/master/docs/Tutorial.md">edit the content above on GitHub</a> and send us a pull request!</p><div class="survey"><div class="survey-image"></div><p>Recently, we have been working hard to make the documentation better based on your feedback. Your responses to this yes/no style survey will help us gauge whether we moved in the right direction with the improvements. Thank you!</p><center><a class="button" href="https://www.facebook.com/survey?oid=516954245168428">Take Survey</a></center></div></div></section><footer class="wrap"><div class="center">© 2016 Facebook Inc.</div></footer></div><div id="fb-root"></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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