diff options
Diffstat (limited to 'files/es/web/javascript/referencia/objetos_globales/object/entries/index.html')
-rw-r--r-- | files/es/web/javascript/referencia/objetos_globales/object/entries/index.html | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/files/es/web/javascript/referencia/objetos_globales/object/entries/index.html b/files/es/web/javascript/referencia/objetos_globales/object/entries/index.html deleted file mode 100644 index 98aff1178a..0000000000 --- a/files/es/web/javascript/referencia/objetos_globales/object/entries/index.html +++ /dev/null @@ -1,161 +0,0 @@ ---- -title: Object.entries() -slug: Web/JavaScript/Referencia/Objetos_globales/Object/entries -translation_of: Web/JavaScript/Reference/Global_Objects/Object/entries ---- -<div>{{JSRef}}</div> - -<p>El método <code><strong>Object.entries()</strong></code> devuelve una matriz de pares propios de una propiedad enumerable [key, value] de un objeto dado, en el mismo orden que es proporcionado por {{jsxref("Sentencias/for...in", "for...in")}} (La diferencia es que un bucle for-in enumera las propiedades en la cadena de prototipos).</p> - -<h2 id="Sintaxis">Sintaxis</h2> - -<pre class="syntaxbox">Object.entries(<var>obj</var>)</pre> - -<h3 id="Parámetros">Parámetros</h3> - -<dl> - <dt><code>obj</code></dt> - <dd>The object whose enumerable own property <code>[key, value]</code> pairs are to be returned.</dd> -</dl> - -<h3 id="Valor_de_retorno">Valor de retorno</h3> - -<p>An array of the given object's own enumerable property <code>[key, value]</code> pairs.</p> - -<h2 id="Descripción">Descripción</h2> - -<p><code>Object.entries()</code> returns an array whose elements are arrays corresponding to the enumerable property <code>[key, value]</code> pairs found directly upon <code>object</code>. The ordering of the properties is the same as that given by looping over the property values of the object manually.</p> - -<h2 id="Ejemplos">Ejemplos</h2> - -<pre class="brush: js">var obj = { foo: 'bar', baz: 42 }; -console.log(Object.entries(obj)); // [ ['foo', 'bar'], ['baz', 42] ] - -// array like object -var obj = { 0: 'a', 1: 'b', 2: 'c' }; -console.log(Object.entries(obj)); // [ ['0', 'a'], ['1', 'b'], ['2', 'c'] ] - -// array like object with random key ordering -var an_obj = { 100: 'a', 2: 'b', 7: 'c' }; -console.log(Object.entries(an_obj)); // [ ['2', 'b'], ['7', 'c'], ['100', 'a'] ] - -// getFoo is property which isn't enumerable -var my_obj = Object.create({}, { getFoo: { value: function() { return this.foo; } } }); -my_obj.foo = 'bar'; -console.log(Object.entries(my_obj)); // [ ['foo', 'bar'] ] - -// non-object argument will be coerced to an object -console.log(Object.entries('foo')); // [ ['0', 'f'], ['1', 'o'], ['2', 'o'] ] - -// iterate through key-value gracefully -var obj = {a: 5, b: 7, c: 9}; -for (var [key, value] of Object.entries(obj)) { - console.log(key + ' ' + value); // "a 5", "b 7", "c 9" -} - -// Or, using array extras -Object.entries(obj).forEach(([key, value]) => { - console.log(key + ' ' + value); // "a 5", "b 7", "c 9" -}); -</pre> - -<h3 id="Converting_an_Object_to_a_Map">Converting an <code>Object</code> to a <code>Map</code></h3> - -<p>The {{jsxref("Map", "new Map()")}} constructor accepts an iterable of <code>entries</code>. With <code>Object.entries</code>, you can easily convert from {{jsxref("Object")}} to {{jsxref("Map")}}:</p> - -<pre class="brush: js">var obj = { foo: 'bar', baz: 42 }; -var map = new Map(Object.entries(obj)); -console.log(map); // Map { foo: "bar", baz: 42 }</pre> - -<h2 id="Polyfill">Polyfill</h2> - -<p>To add compatible <code>Object.entries</code> support in older environments that do not natively support it, you can find a Polyfill in the <a href="https://github.com/tc39/proposal-object-values-entries">tc39/proposal-object-values-entries</a> or in the <a href="https://github.com/es-shims/Object.entries">es-shims/Object.entries</a> repositories.</p> - -<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('ESDraft', '#sec-object.entries', 'Object.entries')}}</td> - <td>{{Spec2('ESDraft')}}</td> - <td>Initial definition.</td> - </tr> - <tr> - <td>{{SpecName('ES8', '#sec-object.entries', 'Object.entries')}}</td> - <td>{{Spec2('ES8')}}</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>{{CompatChrome(54)}}</td> - <td>{{CompatVersionUnknown}}</td> - <td>{{CompatGeckoDesktop(47)}}</td> - <td>{{CompatNo}}</td> - <td>{{CompatNo}}</td> - <td>{{CompatSafari(10.1)}}</td> - </tr> - </tbody> -</table> -</div> - -<div id="compat-mobile"> -<table class="compat-table"> - <tbody> - <tr> - <th>Feature</th> - <th>Android Webview</th> - <th>Chrome for Android</th> - <th>Edge</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>{{CompatChrome(54)}}</td> - <td>{{CompatChrome(54)}}</td> - <td>{{CompatVersionUnknown}}</td> - <td>{{CompatGeckoMobile(47)}}</td> - <td>{{CompatNo}}</td> - <td>{{CompatNo}}</td> - <td>{{CompatNo}}</td> - </tr> - </tbody> -</table> -</div> - -<h2 id="See_also">See also</h2> - -<ul> - <li><a href="/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a></li> - <li>{{jsxref("Object.keys()")}}</li> - <li>{{jsxref("Object.values()")}} {{experimental_inline}}</li> - <li>{{jsxref("Object.prototype.propertyIsEnumerable()")}}</li> - <li>{{jsxref("Object.create()")}}</li> - <li>{{jsxref("Object.getOwnPropertyNames()")}}</li> -</ul> |