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+---
+title: ECMAScript 6 support in Mozilla
+slug: Web/JavaScript/ECMAScript_6_support_in_Mozilla
+translation_of: Archive/Web/JavaScript/New_in_JavaScript/ECMAScript_2015_support_in_Mozilla
+---
+<p>{{jsSidebar("New_in_JS")}}ECMAScript 2015 è la prossima versione standard, nome in codice "Harmony", "ES.next" o "ECMAScript 6". <a href="http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts">Specification drafts possono essere trovate sulla wiki ufficiale</a>. Se si volesse lasciare un feedback sullo standard, si prega di farlo su <a href="https://mail.mozilla.org/listinfo/es-discuss">es-discuss</a>.</p>
+
+<h2 id="Caratteristiche_attualmente_supportate_in_Firefox">Caratteristiche attualmente supportate in  Firefox</h2>
+
+<h3 id="Sintassi">Sintassi</h3>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Caratteristica</th>
+   <th scope="col">Versione</th>
+   <th scope="col">Commenti</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code><a href="/en/JavaScript/Reference/Statements/const" title="const">const</a></code></td>
+   <td>?</td>
+   <td><em>not compliant with the current specification</em><em>: const bindings behave like var instead of let</em></td>
+  </tr>
+  <tr>
+   <td><code><a href="/en/JavaScript/Reference/Statements/let" title="let">let</a></code></td>
+   <td>?</td>
+   <td><em>not compliant with the current specification</em></td>
+  </tr>
+  <tr>
+   <td><a href="/en/JavaScript/New_in_JavaScript/1.7#Destructuring_assignment_%28Merge_into_own_page.2Fsection%29" title="https://developer.mozilla.org/en/New_in_JavaScript_1.7#Destructuring_assignment_%28Merge_into_own_page.2Fsection%29">Destructuring assignment</a></td>
+   <td>JS 1.7</td>
+   <td><em>not compliant with the current specification</em></td>
+  </tr>
+  <tr>
+   <td><code><a href="/en/JavaScript/Reference/Statements/for...of" title="for...of">for...of</a></code> statement</td>
+   <td>{{fx_minversion_inline("13")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><a href="/en/JavaScript/Guide/Iterators_and_Generators" title="Iterators and generators">Iterators e generator</a>i</td>
+   <td>?</td>
+   <td><em>not compliant with the current specification)</em></td>
+  </tr>
+  <tr>
+   <td><a href="/en/JavaScript/Reference/rest_parameters" title="rest parameters">Rest parameters</a></td>
+   <td>{{fx_minversion_inline("15")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>Parametri predefiniti</td>
+   <td>{{fx_minversion_inline("15")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><a href="/en-US/docs/Syntax/Spread_operator" title="/en-US/docs/Syntax/Spread_operator"><span class="external">Spread operator</span></a> of Array</td>
+   <td>{{fx_minversion_inline("16")}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h3 id="Libreria_Standard">Libreria Standard</h3>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Caratteristica</th>
+   <th scope="col">Versione</th>
+   <th scope="col">Commenti</th>
+  </tr>
+  <tr>
+   <td><code><a href="/en/JavaScript/Reference/Global_Objects/Map" title="en/JavaScript/Reference/Global_Objects/Map">Map</a></code></td>
+   <td>{{fx_minversion_inline("13")}}<br>
+    Iterable since {{fx_minversion_inline("17")}}</td>
+   <td>A new type of collections</td>
+  </tr>
+  <tr>
+   <td><code><a href="/en/JavaScript/Reference/Global_Objects/Set" title="en/JavaScript/Reference/Global_Objects/Set">Set</a></code></td>
+   <td>{{fx_minversion_inline("13")}}<br>
+    Iterable since {{fx_minversion_inline("17")}}</td>
+   <td>A new type of collections</td>
+  </tr>
+  <tr>
+   <td><code><a href="/en/JavaScript/Reference/Global_Objects/WeakMap" title="WeakMap">WeakMap</a></code></td>
+   <td>{{fx_minversion_inline("6")}}<br>
+    <code>clear()</code> in {{fx_minversion_inline("20")}}</td>
+   <td>A new type of collections</td>
+  </tr>
+  <tr>
+   <td><code><a href="/en/JavaScript/Reference/Global_Objects/Proxy" title="Proxy">Proxy</a></code></td>
+   <td>{{fx_minversion_inline("18")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><a href="/en/JavaScript/Reference/Global_Objects/RegExp" title="RegExp"><span class="external text"><code>RegExp</code> sticky (<code>y</code>) flag</span></a></td>
+   <td>?</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><code><a href="/en-US/docs/JavaScript/Reference/Global_Objects/Number/isNaN" title="/en-US/docs/JavaScript/Reference/Global_Objects/Number/isNaN">Number.isNaN()</a></code></td>
+   <td>{{fx_minversion_inline("16")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><code>Number.isFinite()</code></td>
+   <td>{{fx_minversion_inline("16")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><code>Number.toInteger()</code></td>
+   <td>{{fx_minversion_inline("16")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><code>Number.isInteger()</code></td>
+   <td>{{fx_minversion_inline("16")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><code><a href="/en-US/docs/JavaScript/Reference/Global_Objects/String/startsWith" title="/en-US/docs/JavaScript/Reference/Global_Objects/String/startsWith">String.startsWith()</a></code></td>
+   <td>{{fx_minversion_inline("17")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><code><a href="/en-US/docs/JavaScript/Reference/Global_Objects/String/endsWith" title="/en-US/docs/JavaScript/Reference/Global_Objects/String/endsWith">String.endsWith()</a></code></td>
+   <td>{{fx_minversion_inline("17")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td><code><a href="/en-US/docs/JavaScript/Reference/Global_Objects/String/contains" title="/en-US/docs/JavaScript/Reference/Global_Objects/String/contains">String.contains()</a></code></td>
+   <td>{{fx_minversion_inline("17")}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Caratteristiche_non_ancora_supportate">Caratteristiche non ancora supportate</h2>
+
+<ul>
+ <li>Operatore <code>is</code> e <span style="font-family: 'Courier New','Andale Mono',monospace; line-height: normal;">isnt</span></li>
+ <li>Nuove funzioni <code>Math</code>  (<code>log10</code>, <code>log2</code>, <code>log1p</code>, <code>expm1</code>, <code>cosh</code>, <code>sinh</code>, <code>tanh</code>, <code>acosh</code>, <code>asinh</code>, <code>atanh</code>, <code>hypot</code>, <code>trunc</code>, <code>sign</code>)</li>
+ <li>Moduli</li>
+</ul>
+
+<h2 id="Guarda_anche">Guarda anche</h2>
+
+<ul>
+ <li><a class="external" href="http://www.ecmascript.org/" title="http://www.ecmascript.org/">Sito ECMAScript</a></li>
+ <li><a class="external" href="http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts" title="http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts">ECMAScript 6 specification drafts</a></li>
+ <li><a class="link-https" href="https://bugzilla.mozilla.org/show_bug.cgi?id=694100" title="https://bugzilla.mozilla.org/show_bug.cgi?id=694100">Mozilla Harmony tracking bug</a></li>
+</ul>