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----
-title: Symbol.hasInstance
-slug: Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance
-tags:
-  - Propriedade
-  - Referencia
-translation_of: Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance
----
-<div>{{JSRef}}</div>
-
-<p>O symbol bem-conhecido <strong><code>Symbol.hasInstance</code></strong> é usado para determinar se um objecto construtor reconhece um objecto como de sua instância. O comportamento do operador {{jsxref("Operators/instanceof", "instanceof")}} pode ser customizado por este symbol.</p>
-
-<div>{{js_property_attributes(0,0,0)}}</div>
-
-<h2 id="Exemplos">Exemplos</h2>
-
-<p>Tu podes implementar o comportamento customizado do seu <code>instanceof</code> deste jeito; por exemplo:</p>
-
-<pre class="brush: js">class MyArray {
-  static [Symbol.hasInstance](instance) {
-    return this.prototype.isPrototypeOf(instance) ||
-           Array.isArray(instance);
-  }
-}
-
-console.log([] instanceof MyArray); // true
-console.log(new MyArray instanceof MyArray); // true
-console.log(new Image instanceof MyArray); // false
-
-class MySubArray extends MyArray {}
-console.log(new MySubArray instanceof MySubArray); // true
-console.log(new MySubArray instanceof MyArray); // true
-console.log(new MyArray instanceof MySubArray); // false</pre>
-
-<h2 id="Especificações">Especificações</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('ES6', '#sec-symbol.hasinstance', 'Symbol.hasInstance')}}</td>
-   <td>{{Spec2('ES6')}}</td>
-   <td>Initial definition.</td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-symbol.hasinstance', 'Symbol.hasInstance')}}</td>
-   <td>{{Spec2('ESDraft')}}</td>
-   <td> </td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="Compatibilidade_com_os_navegadores">Compatibilidade com os navegadores</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(51)}}</td>
-   <td>{{ CompatGeckoDesktop(50) }}</td>
-   <td>{{CompatNo}}</td>
-   <td>{{CompatUnknown}}</td>
-   <td>{{CompatUnknown}}</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>{{CompatUnknown}}</td>
-   <td>{{CompatUnknown}}</td>
-   <td>{{ CompatGeckoMobile(50) }}</td>
-   <td>{{CompatNo}}</td>
-   <td>{{CompatUnknown}}</td>
-   <td>{{CompatUnknown}}</td>
-  </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="Veja_também">Veja também</h2>
-
-<ul>
- <li>{{jsxref("Operators/instanceof", "instanceof")}}</li>
- <li>{{jsxref("Global_Objects/Object/isPrototypeOf", "isPrototypeOf()")}}</li>
-</ul>