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authorFlorian Merz <me@fiji-flo.de>2021-02-11 14:46:50 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 14:46:50 +0100
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+---
+title: Generator.prototype.throw()
+slug: Web/JavaScript/Referencia/Objetos_globales/Generador/throw
+translation_of: Web/JavaScript/Reference/Global_Objects/Generator/throw
+---
+<div>{{JSRef}}</div>
+
+<p>El método <code><strong>throw()</strong></code> reanuda la ejecución de un generador al lanzar un error en éste y regresar un objeto con las dos propiedades <code>done</code> y <code>value</code>.</p>
+
+<h2 id="Sintaxis">Sintaxis</h2>
+
+<pre class="syntaxbox"><code><var>gen</var>.throw(excepción)</code></pre>
+
+<h3 id="Parámetros">Parámetros</h3>
+
+<dl>
+ <dt><code>excepción</code></dt>
+ <dd>La excepción a lanzar. Al hacer depuración, es útil que la excepción cumpla con <code>instanceof</code> {{jsxref("Error")}}.</dd>
+</dl>
+
+<h3 id="Valor_de_retorno">Valor de retorno</h3>
+
+<p>Un {{jsxref("Object")}} con dos propiedades:</p>
+
+<ul>
+ <li><code>done</code> (booleano)
+
+ <ul>
+ <li>Es <code>verdadero</code> si el iterador ya llegó al final de la secuencia. En este caso <code>valor</code> define opcionalmente el <em>valor de retorno</em> del iterador.</li>
+ <li>Es <code>falso</code> si el iterador puede dar un siguiente valor en la secuencia. Es equivalente a no definir la propiedad <code>done</code>.</li>
+ </ul>
+ </li>
+ <li><code>value</code> - cualquier valor Javascript regresado por el iterador. Éste puede ser omitido si <code>done</code> is <code>verdadero</code>.</li>
+</ul>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Using_throw()">Using <code>throw()</code></h3>
+
+<p>The following example shows a simple generator and an error that is thrown using the <code>throw</code> method. An error can be caught by a <code><a href="/en-US/docs/Web/JavaScript/Reference/Statements/try...catch">try...catch</a></code> block as usual.</p>
+
+<pre class="brush: js">function* gen() {
+ while(true) {
+ try {
+ yield 42;
+ } catch(e) {
+ console.log('Error caught!');
+ }
+ }
+}
+
+var g = gen();
+g.next();
+// { value: 42, done: false }
+g.throw(new Error('Something went wrong'));
+// "Error caught!"
+// { value: 42, done: false }
+</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.throw', 'Generator.prototype.throw')}}</td>
+ <td>{{Spec2('ES2015')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-generator.prototype.throw', 'Generator.prototype.throw')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+
+
+<p>{{Compat("javascript.builtins.Generator.throw")}}</p>
+</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>
+</ul>