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+---
+title: Generator
+slug: Web/JavaScript/Reference/Global_Objects/Generator
+tags:
+  - ECMAScript 2015
+  - Generator
+  - JavaScript
+  - Legacy Generator
+  - Legacy Iterator
+  - NeedsTranslation
+  - Reference
+  - TopicStub
+translation_of: Web/JavaScript/Reference/Global_Objects/Generator
+---
+<div>{{JSRef}}</div>
+
+<p>The <code><strong>Generator</strong></code> object is returned by a {{jsxref("Statements/function*", "generator function", "", 1)}} and it conforms to both the <a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#iterable">iterable protocol</a> and the <a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#iterator">iterator protocol</a>.</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox">function* gen() {
+  yield 1;
+  yield 2;
+  yield 3;
+}
+
+var g = gen(); // "Generator { }"</pre>
+
+<h2 id="Methods">Methods</h2>
+
+<dl>
+ <dt>{{jsxref("Generator.prototype.next()")}}</dt>
+ <dd>Returns a value yielded by the {{jsxref("Operators/yield", "yield")}} expression.</dd>
+ <dt>{{jsxref("Generator.prototype.return()")}}</dt>
+ <dd>Returns the given value and finishes the generator.</dd>
+ <dt>{{jsxref("Generator.prototype.throw()")}}</dt>
+ <dd>Throws an error to a generator.</dd>
+</dl>
+
+<h2 id="Example">Example</h2>
+
+<h3 id="An_infinite_iterator">An infinite iterator</h3>
+
+<pre class="brush: js">function* idMaker() {
+    var index = 0;
+    while(true)
+        yield index++;
+}
+
+var gen = idMaker(); // "Generator { }"
+
+console.log(gen.next().value); // 0
+console.log(gen.next().value); // 1
+console.log(gen.next().value); // 2
+// ...</pre>
+
+<h2 id="Legacy_generator_objects">Legacy generator objects</h2>
+
+<p>Firefox (SpiderMonkey) also implements an earlier version of generators in <a href="/en-US/docs/Web/JavaScript/New_in_JavaScript/1.7">JavaScript 1.7</a>, where the star (*) in the function declaration was not necessary (you just use the <code>yield</code> keyword in the function body). However, legacy generators are deprecated. Do not use them; they are going to be removed ({{bug(1083482)}}).</p>
+
+<h3 id="Legacy_generator_methods">Legacy generator methods</h3>
+
+<dl>
+ <dt><code>Generator.prototype.next() </code>{{non-standard_inline}}</dt>
+ <dd>Returns a value yielded by the {{jsxref("Operators/yield", "yield")}} expression. This corresponds to <code>next()</code> in the ES2015 generator object.</dd>
+ <dt><code>Generator.prototype.close()</code> {{non-standard_inline}}</dt>
+ <dd>Closes the generator, so that when calling <code>next()</code> an {{jsxref("StopIteration")}} error will be thrown. This corresponds to the <code>return()</code> method in the ES2015 generator object.</dd>
+ <dt><code>Generator.prototype.send()</code> {{non-standard_inline}}</dt>
+ <dd>Used to send a value to a generator. The value is returned from the {{jsxref("Operators/yield", "yield")}} expression, and returns a value yielded by the next {{jsxref("Operators/yield", "yield")}} expression. <code>send(x)</code> corresponds to <code>next(x)</code> in the ES2015 generator object.</dd>
+ <dt><strong><code>Generator.</code></strong><code>prototype.</code><strong><code>throw()</code> </strong> {{non-standard_inline}}</dt>
+ <dd>Throws an error to a generator. This corresponds to the <code>throw()</code> method in the ES2015 generator object.</dd>
+</dl>
+
+<h3 id="Legacy_generator_example">Legacy generator example</h3>
+
+<pre class="brush: js">function* fibonacci() {
+  var a = yield 1;
+  yield a * 2;
+}
+
+var it = fibonacci();
+console.log(it);          // "Generator {  }"
+console.log(it.next());   // 1
+console.log(it.send(10)); // 20
+console.log(it.close());  // undefined
+console.log(it.next());   // throws StopIteration (as the generator is now closed)
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-generator-objects', 'Generator objects')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-generator-objects', 'Generator objects')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(39.0)}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Android Webview</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(39.0)}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(39.0)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<h3 id="Legacy_generators">Legacy generators</h3>
+
+<ul>
+ <li>{{jsxref("Statements/Legacy_generator_function", "The legacy generator function", "", 1)}}</li>
+ <li>{{jsxref("Operators/Legacy_generator_function", "The legacy generator function expression", "", 1)}}</li>
+ <li>{{jsxref("StopIteration")}}</li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Deprecated_and_obsolete_features/The_legacy_Iterator_protocol">The legacy Iterator protocol</a></li>
+</ul>
+
+<h3 id="ES2015_generators">ES2015 generators</h3>
+
+<ul>
+ <li>{{jsxref("Functions", "Functions", "", 1)}}</li>
+ <li>{{jsxref("Statements/function", "function")}}</li>
+ <li>{{jsxref("Operators/function", "function expression")}}</li>
+ <li>{{jsxref("Function")}}</li>
+ <li>{{jsxref("Statements/function*", "function*")}}</li>
+ <li>{{jsxref("Operators/function*", "function* expression")}}</li>
+ <li>{{jsxref("GeneratorFunction")}}</li>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/The_Iterator_protocol">The Iterator protocol</a></li>
+</ul>
diff --git a/files/it/web/javascript/reference/global_objects/generator/next/index.html b/files/it/web/javascript/reference/global_objects/generator/next/index.html
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--- /dev/null
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+---
+title: Generator.prototype.next()
+slug: Web/JavaScript/Reference/Global_Objects/Generator/next
+translation_of: Web/JavaScript/Reference/Global_Objects/Generator/next
+---
+<div>{{JSRef}}</div>
+
+<p>Il metodo  <code><strong>next</strong></code><strong><code>()</code></strong> ritorna un oggetto con due  proprietà  <code>done</code> and <code>value</code>. Puoi anche fornire un parametro al metodo next per trasmettere un valore al generatore.</p>
+
+<h2 id="Syntassi">Syntassi</h2>
+
+<pre class="syntaxbox"><code><var>gen</var>.next(value)</code></pre>
+
+<h3 id="Parametri">Parametri</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>Il valore trasmesso al generatore</dd>
+</dl>
+
+<h3 id="Return_value">Return value</h3>
+
+<p>Un <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">Oggetto</a> con due proprietà:</p>
+
+<ul>
+ <li><code>done</code> (boolean)
+
+  <ul>
+   <li>Ha il valore  <code>true</code>  se l' iteratore è oltre  la fine  della sequenza iterata. In questo caso   <code>value</code> opzionalmente  specifica <em>il valore di ritorno</em> dell' iteratore.</li>
+   <li>Ha il valore <code>false</code> se l'iteratore è stato capace di generare il valore successivo nella sequenza. Questo equivale nello non specificare la proprietà  done interamente.</li>
+  </ul>
+ </li>
+ <li><code>value</code> -  ogni valore Javascript ritornato dall'iteratore. Può essere omesso quando done è true</li>
+</ul>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Using_next()">Using <code>next()</code></h3>
+
+<p><font face="Consolas, Liberation Mono, Courier, monospace">Il seguente esempio mostra semplice generatore e un oggetto che il metodo next ritorna:</font></p>
+
+<pre class="brush: js">function* gen() {
+  yield 1;
+  yield 2;
+  yield 3;
+}
+
+var g = gen(); // "Generator { }"
+g.next();      // "Object { value: 1, done: false }"
+g.next();      // "Object { value: 2, done: false }"
+g.next();      // "Object { value: 3, done: false }"
+g.next();      // "Object { value: undefined, done: true }"
+</pre>
+
+<h3 id="Mandare_valori_al_generatore">Mandare valori al generatore</h3>
+
+<p>In questo esempio, next è stato chiamato con un valore. Nota che la prima chiamata non ha registrato nulla, perche il generatore non ha raccolto nulla inizialmente. </p>
+
+<p> </p>
+
+<pre class="brush: js">function* gen() {
+  while(true) {
+    var value = yield null;
+    console.log(value);
+  }
+}
+
+var g = gen();
+g.next(1);
+// "{ value: null, done: false }"
+g.next(2);
+// "{ value: null, done: false }"
+// 2
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-generator.prototype.next', 'Generator.prototype.next')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-generator.prototype.next', 'Generator.prototype.next')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>13</td>
+   <td>{{CompatGeckoDesktop(26)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatSafari(10)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>5.1</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile(26)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>10</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><code><a href="/en-US/docs/Web/JavaScript/Reference/Statements/function*">function*</a></code></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators">Iterators and generators</a></li>
+</ul>