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docs/next/network.html

@@ -92,31 +92,42 @@
 <h4><a class="anchor" aria-hidden="true" id="handling-the-response"></a><a href="#handling-the-response" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" 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>Handling the response</h4>
 <p>The above examples show how you can make a request. In many cases, you will want to do something with the response.</p>
 <p>Networking is an inherently asynchronous operation. Fetch methods will return a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a> that makes it straightforward to write code that works in an asynchronous manner:</p>
-<pre><code class="hljs css language-jsx"><span class="token keyword">function</span> <span class="token function">getMoviesFromApiAsync</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
+<pre><code class="hljs css language-jsx"><span class="token keyword">function</span> <span class="token function">getMoviesFromApi</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 function">fetch</span><span class="token punctuation">(</span><span class="token string">'https://facebook.github.io/react-native/movies.json'</span><span class="token punctuation">)</span>
     <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=></span> response<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
-    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">responseJson</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
-      <span class="token keyword">return</span> responseJson<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
+    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">json</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
+      <span class="token keyword">return</span> json<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
     <span class="token punctuation">}</span><span class="token punctuation">)</span>
     <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">error</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
       console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span>
 </code></pre>
-<p>You can also use the proposed ES2017 <code>async</code>/<code>await</code> syntax in a React Native app:</p>
-<pre><code class="hljs css language-jsx"><span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">getMoviesFromApi</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
+<p>You can also use the <code>async</code> / <code>await</code> syntax in a React Native app:</p>
+<pre><code class="hljs css language-jsx"><span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">getMoviesFromApiAsync</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">try</span> <span class="token punctuation">{</span>
     <span class="token keyword">let</span> response <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token function">fetch</span><span class="token punctuation">(</span>
       <span class="token string">'https://facebook.github.io/react-native/movies.json'</span><span class="token punctuation">,</span>
     <span class="token punctuation">)</span><span class="token punctuation">;</span>
-    <span class="token keyword">let</span> responseJson <span class="token operator">=</span> <span class="token keyword">await</span> response<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
-    <span class="token keyword">return</span> responseJson<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
+    <span class="token keyword">let</span> json <span class="token operator">=</span> <span class="token keyword">await</span> response<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
+    <span class="token keyword">return</span> json<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
   <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>error<span class="token punctuation">)</span> <span class="token punctuation">{</span>
     console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>
 <span class="token punctuation">}</span>
 </code></pre>
 <p>Don't forget to catch any errors that may be thrown by <code>fetch</code>, otherwise they will be dropped silently.</p>
+<div class="toggler">
+  <ul role="tablist" class="toggle-syntax">
+    <li id="functional" class="button-functional" aria-selected="false" role="tab" tabindex="0" aria-controls="functionaltab" onclick="displayTabs('syntax', 'functional')">
+      Function Component Example
+    </li>
+    <li id="classical" class="button-classical" aria-selected="false" role="tab" tabindex="0" aria-controls="classicaltab" onclick="displayTabs('syntax', 'classical')">
+      Class Component Example
+    </li>
+  </ul>
+</div>
+<p><block class="functional syntax" /></p>
 <div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { useEffect, useState } <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
 <span class="hljs-keyword">import</span> { ActivityIndicator, FlatList, Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
 
@@ -161,7 +172,67 @@
           height: 514px;
           width: 100%;
         "
-      ></div></div></div><blockquote>
+      ></div></div></div><p><block class="classical syntax" /></p>
+<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { Component } <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
+<span class="hljs-keyword">import</span> { ActivityIndicator, FlatList, Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
+
+<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">App</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
+  <span class="hljs-keyword">constructor</span>(props) {
+    <span class="hljs-keyword">super</span>(props);
+
+    <span class="hljs-keyword">this</span>.state = {
+      <span class="hljs-attr">data</span>: [],
+      <span class="hljs-attr">isLoading</span>: <span class="hljs-literal">true</span>
+    };
+  }
+
+  componentDidMount() {
+    fetch(<span class="hljs-string">'https://facebook.github.io/react-native/movies.json'</span>)
+      .then(<span class="hljs-function">(<span class="hljs-params">response</span>) =&gt;</span> response.json())
+      .then(<span class="hljs-function">(<span class="hljs-params">json</span>) =&gt;</span> {
+        <span class="hljs-keyword">this</span>.setState({ <span class="hljs-attr">data</span>: json.movies });
+      })
+      .catch(<span class="hljs-function">(<span class="hljs-params">error</span>) =&gt;</span> <span class="hljs-built_in">console</span>.error(error))
+      .finally(<span class="hljs-function"><span class="hljs-params">()</span> =&gt;</span> {
+        <span class="hljs-keyword">this</span>.setState({ <span class="hljs-attr">isLoading</span>: <span class="hljs-literal">false</span> });
+      });
+  }
+
+  render() {
+    <span class="hljs-keyword">const</span> { data, isLoading } = <span class="hljs-keyword">this</span>.state;
+
+    <span class="hljs-keyword">return</span> (
+      <span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{</span> <span class="hljs-attr">flex:</span> <span class="hljs-attr">1</span>, <span class="hljs-attr">padding:</span> <span class="hljs-attr">24</span> }}&gt;</span>
+        {isLoading ? <span class="hljs-tag">&lt;<span class="hljs-name">ActivityIndicator</span>/&gt;</span> : (
+          <span class="hljs-tag">&lt;<span class="hljs-name">FlatList</span>
+            <span class="hljs-attr">data</span>=<span class="hljs-string">{data}</span>
+            <span class="hljs-attr">keyExtractor</span>=<span class="hljs-string">{({</span> <span class="hljs-attr">id</span> }, <span class="hljs-attr">index</span>) =&gt;</span> id}
+            renderItem={({ item }) =&gt; (
+              <span class="hljs-tag">&lt;<span class="hljs-name">Text</span>&gt;</span>{item.title}, {item.releaseYear}<span class="hljs-tag">&lt;/<span class="hljs-name">Text</span>&gt;</span>
+            )}
+          /&gt;
+        )}
+      <span class="hljs-tag">&lt;/<span class="hljs-name">View</span>&gt;</span>
+    );
+  }
+};
+</span></code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
+        data-snack-name="Fetch Example"
+        data-snack-description="Example usage"
+        data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20ActivityIndicator%2C%20FlatList%2C%20Text%2C%20View%20%7D%20from%20'react-native'%3B%0A%0Aexport%20default%20class%20App%20extends%20Component%20%7B%0A%20%20constructor(props)%20%7B%0A%20%20%20%20super(props)%3B%0A%0A%20%20%20%20this.state%20%3D%20%7B%0A%20%20%20%20%20%20data%3A%20%5B%5D%2C%0A%20%20%20%20%20%20isLoading%3A%20true%0A%20%20%20%20%7D%3B%0A%20%20%7D%0A%0A%20%20componentDidMount()%20%7B%0A%20%20%20%20fetch('https%3A%2F%2Ffacebook.github.io%2Freact-native%2Fmovies.json')%0A%20%20%20%20%20%20.then((response)%20%3D%3E%20response.json())%0A%20%20%20%20%20%20.then((json)%20%3D%3E%20%7B%0A%20%20%20%20%20%20%20%20this.setState(%7B%20data%3A%20json.movies%20%7D)%3B%0A%20%20%20%20%20%20%7D)%0A%20%20%20%20%20%20.catch((error)%20%3D%3E%20console.error(error))%0A%20%20%20%20%20%20.finally(()%20%3D%3E%20%7B%0A%20%20%20%20%20%20%20%20this.setState(%7B%20isLoading%3A%20false%20%7D)%3B%0A%20%20%20%20%20%20%7D)%3B%0A%20%20%7D%0A%0A%20%20render()%20%7B%0A%20%20%20%20const%20%7B%20data%2C%20isLoading%20%7D%20%3D%20this.state%3B%0A%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%20style%3D%7B%7B%20flex%3A%201%2C%20padding%3A%2024%20%7D%7D%3E%0A%20%20%20%20%20%20%20%20%7BisLoading%20%3F%20%3CActivityIndicator%2F%3E%20%3A%20(%0A%20%20%20%20%20%20%20%20%20%20%3CFlatList%0A%20%20%20%20%20%20%20%20%20%20%20%20data%3D%7Bdata%7D%0A%20%20%20%20%20%20%20%20%20%20%20%20keyExtractor%3D%7B(%7B%20id%20%7D%2C%20index)%20%3D%3E%20id%7D%0A%20%20%20%20%20%20%20%20%20%20%20%20renderItem%3D%7B(%7B%20item%20%7D)%20%3D%3E%20(%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%3CText%3E%7Bitem.title%7D%2C%20%7Bitem.releaseYear%7D%3C%2FText%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20)%7D%0A%20%20%20%20%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%20%20%20%20)%7D%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%3B%0A"
+        data-snack-platform="web"
+        data-snack-supported-platforms=ios,android,web
+        data-snack-preview="true"
+        style="
+          overflow: hidden;
+          background: #fafafa;
+          border: 1px solid rgba(0,0,0,.16);
+          border-radius: 4px;
+          height: 514px;
+          width: 100%;
+        "
+      ></div></div></div><p><block class="endBlock syntax" /></p>
+<blockquote>
 <p>By default, iOS will block any request that's not encrypted using <a href="https://hosting.review/web-hosting-glossary/#12">SSL</a>. If you need to fetch from a cleartext URL (one that begins with <code>http</code>) you will first need to <a href="/react-native/docs/next/integration-with-existing-apps#test-your-integration">add an App Transport Security exception</a>. If you know ahead of time what domains you will need access to, it is more secure to add exceptions only for those domains; if the domains are not known until runtime you can <a href="/react-native/docs/next/integration-with-existing-apps#app-transport-security">disable ATS completely</a>. Note however that from January 2017, <a href="https://forums.developer.apple.com/thread/48979">Apple's App Store review will require reasonable justification for disabling ATS</a>. See <a href="https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW33">Apple's documentation</a> for more information.</p>
 </blockquote>
 <h3><a class="anchor" aria-hidden="true" id="using-other-networking-libraries"></a><a href="#using-other-networking-libraries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" 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>Using Other Networking Libraries</h3>

docs/next/network/index.html

@@ -92,31 +92,42 @@
 <h4><a class="anchor" aria-hidden="true" id="handling-the-response"></a><a href="#handling-the-response" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" 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>Handling the response</h4>
 <p>The above examples show how you can make a request. In many cases, you will want to do something with the response.</p>
 <p>Networking is an inherently asynchronous operation. Fetch methods will return a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a> that makes it straightforward to write code that works in an asynchronous manner:</p>
-<pre><code class="hljs css language-jsx"><span class="token keyword">function</span> <span class="token function">getMoviesFromApiAsync</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
+<pre><code class="hljs css language-jsx"><span class="token keyword">function</span> <span class="token function">getMoviesFromApi</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 function">fetch</span><span class="token punctuation">(</span><span class="token string">'https://facebook.github.io/react-native/movies.json'</span><span class="token punctuation">)</span>
     <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=></span> response<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
-    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">responseJson</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
-      <span class="token keyword">return</span> responseJson<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
+    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">json</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
+      <span class="token keyword">return</span> json<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
     <span class="token punctuation">}</span><span class="token punctuation">)</span>
     <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">error</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
       console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span>
 </code></pre>
-<p>You can also use the proposed ES2017 <code>async</code>/<code>await</code> syntax in a React Native app:</p>
-<pre><code class="hljs css language-jsx"><span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">getMoviesFromApi</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
+<p>You can also use the <code>async</code> / <code>await</code> syntax in a React Native app:</p>
+<pre><code class="hljs css language-jsx"><span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">getMoviesFromApiAsync</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">try</span> <span class="token punctuation">{</span>
     <span class="token keyword">let</span> response <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token function">fetch</span><span class="token punctuation">(</span>
       <span class="token string">'https://facebook.github.io/react-native/movies.json'</span><span class="token punctuation">,</span>
     <span class="token punctuation">)</span><span class="token punctuation">;</span>
-    <span class="token keyword">let</span> responseJson <span class="token operator">=</span> <span class="token keyword">await</span> response<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
-    <span class="token keyword">return</span> responseJson<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
+    <span class="token keyword">let</span> json <span class="token operator">=</span> <span class="token keyword">await</span> response<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
+    <span class="token keyword">return</span> json<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
   <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>error<span class="token punctuation">)</span> <span class="token punctuation">{</span>
     console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>
 <span class="token punctuation">}</span>
 </code></pre>
 <p>Don't forget to catch any errors that may be thrown by <code>fetch</code>, otherwise they will be dropped silently.</p>
+<div class="toggler">
+  <ul role="tablist" class="toggle-syntax">
+    <li id="functional" class="button-functional" aria-selected="false" role="tab" tabindex="0" aria-controls="functionaltab" onclick="displayTabs('syntax', 'functional')">
+      Function Component Example
+    </li>
+    <li id="classical" class="button-classical" aria-selected="false" role="tab" tabindex="0" aria-controls="classicaltab" onclick="displayTabs('syntax', 'classical')">
+      Class Component Example
+    </li>
+  </ul>
+</div>
+<p><block class="functional syntax" /></p>
 <div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { useEffect, useState } <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
 <span class="hljs-keyword">import</span> { ActivityIndicator, FlatList, Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
 
@@ -161,7 +172,67 @@
           height: 514px;
           width: 100%;
         "
-      ></div></div></div><blockquote>
+      ></div></div></div><p><block class="classical syntax" /></p>
+<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { Component } <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
+<span class="hljs-keyword">import</span> { ActivityIndicator, FlatList, Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
+
+<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">App</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
+  <span class="hljs-keyword">constructor</span>(props) {
+    <span class="hljs-keyword">super</span>(props);
+
+    <span class="hljs-keyword">this</span>.state = {
+      <span class="hljs-attr">data</span>: [],
+      <span class="hljs-attr">isLoading</span>: <span class="hljs-literal">true</span>
+    };
+  }
+
+  componentDidMount() {
+    fetch(<span class="hljs-string">'https://facebook.github.io/react-native/movies.json'</span>)
+      .then(<span class="hljs-function">(<span class="hljs-params">response</span>) =&gt;</span> response.json())
+      .then(<span class="hljs-function">(<span class="hljs-params">json</span>) =&gt;</span> {
+        <span class="hljs-keyword">this</span>.setState({ <span class="hljs-attr">data</span>: json.movies });
+      })
+      .catch(<span class="hljs-function">(<span class="hljs-params">error</span>) =&gt;</span> <span class="hljs-built_in">console</span>.error(error))
+      .finally(<span class="hljs-function"><span class="hljs-params">()</span> =&gt;</span> {
+        <span class="hljs-keyword">this</span>.setState({ <span class="hljs-attr">isLoading</span>: <span class="hljs-literal">false</span> });
+      });
+  }
+
+  render() {
+    <span class="hljs-keyword">const</span> { data, isLoading } = <span class="hljs-keyword">this</span>.state;
+
+    <span class="hljs-keyword">return</span> (
+      <span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{</span> <span class="hljs-attr">flex:</span> <span class="hljs-attr">1</span>, <span class="hljs-attr">padding:</span> <span class="hljs-attr">24</span> }}&gt;</span>
+        {isLoading ? <span class="hljs-tag">&lt;<span class="hljs-name">ActivityIndicator</span>/&gt;</span> : (
+          <span class="hljs-tag">&lt;<span class="hljs-name">FlatList</span>
+            <span class="hljs-attr">data</span>=<span class="hljs-string">{data}</span>
+            <span class="hljs-attr">keyExtractor</span>=<span class="hljs-string">{({</span> <span class="hljs-attr">id</span> }, <span class="hljs-attr">index</span>) =&gt;</span> id}
+            renderItem={({ item }) =&gt; (
+              <span class="hljs-tag">&lt;<span class="hljs-name">Text</span>&gt;</span>{item.title}, {item.releaseYear}<span class="hljs-tag">&lt;/<span class="hljs-name">Text</span>&gt;</span>
+            )}
+          /&gt;
+        )}
+      <span class="hljs-tag">&lt;/<span class="hljs-name">View</span>&gt;</span>
+    );
+  }
+};
+</span></code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
+        data-snack-name="Fetch Example"
+        data-snack-description="Example usage"
+        data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20ActivityIndicator%2C%20FlatList%2C%20Text%2C%20View%20%7D%20from%20'react-native'%3B%0A%0Aexport%20default%20class%20App%20extends%20Component%20%7B%0A%20%20constructor(props)%20%7B%0A%20%20%20%20super(props)%3B%0A%0A%20%20%20%20this.state%20%3D%20%7B%0A%20%20%20%20%20%20data%3A%20%5B%5D%2C%0A%20%20%20%20%20%20isLoading%3A%20true%0A%20%20%20%20%7D%3B%0A%20%20%7D%0A%0A%20%20componentDidMount()%20%7B%0A%20%20%20%20fetch('https%3A%2F%2Ffacebook.github.io%2Freact-native%2Fmovies.json')%0A%20%20%20%20%20%20.then((response)%20%3D%3E%20response.json())%0A%20%20%20%20%20%20.then((json)%20%3D%3E%20%7B%0A%20%20%20%20%20%20%20%20this.setState(%7B%20data%3A%20json.movies%20%7D)%3B%0A%20%20%20%20%20%20%7D)%0A%20%20%20%20%20%20.catch((error)%20%3D%3E%20console.error(error))%0A%20%20%20%20%20%20.finally(()%20%3D%3E%20%7B%0A%20%20%20%20%20%20%20%20this.setState(%7B%20isLoading%3A%20false%20%7D)%3B%0A%20%20%20%20%20%20%7D)%3B%0A%20%20%7D%0A%0A%20%20render()%20%7B%0A%20%20%20%20const%20%7B%20data%2C%20isLoading%20%7D%20%3D%20this.state%3B%0A%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%20style%3D%7B%7B%20flex%3A%201%2C%20padding%3A%2024%20%7D%7D%3E%0A%20%20%20%20%20%20%20%20%7BisLoading%20%3F%20%3CActivityIndicator%2F%3E%20%3A%20(%0A%20%20%20%20%20%20%20%20%20%20%3CFlatList%0A%20%20%20%20%20%20%20%20%20%20%20%20data%3D%7Bdata%7D%0A%20%20%20%20%20%20%20%20%20%20%20%20keyExtractor%3D%7B(%7B%20id%20%7D%2C%20index)%20%3D%3E%20id%7D%0A%20%20%20%20%20%20%20%20%20%20%20%20renderItem%3D%7B(%7B%20item%20%7D)%20%3D%3E%20(%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%3CText%3E%7Bitem.title%7D%2C%20%7Bitem.releaseYear%7D%3C%2FText%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20)%7D%0A%20%20%20%20%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%20%20%20%20)%7D%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%3B%0A"
+        data-snack-platform="web"
+        data-snack-supported-platforms=ios,android,web
+        data-snack-preview="true"
+        style="
+          overflow: hidden;
+          background: #fafafa;
+          border: 1px solid rgba(0,0,0,.16);
+          border-radius: 4px;
+          height: 514px;
+          width: 100%;
+        "
+      ></div></div></div><p><block class="endBlock syntax" /></p>
+<blockquote>
 <p>By default, iOS will block any request that's not encrypted using <a href="https://hosting.review/web-hosting-glossary/#12">SSL</a>. If you need to fetch from a cleartext URL (one that begins with <code>http</code>) you will first need to <a href="/react-native/docs/next/integration-with-existing-apps#test-your-integration">add an App Transport Security exception</a>. If you know ahead of time what domains you will need access to, it is more secure to add exceptions only for those domains; if the domains are not known until runtime you can <a href="/react-native/docs/next/integration-with-existing-apps#app-transport-security">disable ATS completely</a>. Note however that from January 2017, <a href="https://forums.developer.apple.com/thread/48979">Apple's App Store review will require reasonable justification for disabling ATS</a>. See <a href="https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW33">Apple's documentation</a> for more information.</p>
 </blockquote>
 <h3><a class="anchor" aria-hidden="true" id="using-other-networking-libraries"></a><a href="#using-other-networking-libraries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" 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>Using Other Networking Libraries</h3>