From a55b575e8089ee6cab7c5c262a7e6db55d0e34d6 Mon Sep 17 00:00:00 2001 From: Florian Merz Date: Thu, 11 Feb 2021 14:46:50 +0100 Subject: unslug es: move --- .../reference/global_objects/array/keys/index.html | 84 ++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 files/es/web/javascript/reference/global_objects/array/keys/index.html (limited to 'files/es/web/javascript/reference/global_objects/array/keys') diff --git a/files/es/web/javascript/reference/global_objects/array/keys/index.html b/files/es/web/javascript/reference/global_objects/array/keys/index.html new file mode 100644 index 0000000000..ff7cb593f5 --- /dev/null +++ b/files/es/web/javascript/reference/global_objects/array/keys/index.html @@ -0,0 +1,84 @@ +--- +title: Array.prototype.keys() +slug: Web/JavaScript/Referencia/Objetos_globales/Array/keys +tags: + - Array + - ECMAScript 2015 + - Iterator + - JavaScript + - Matriz + - Prototipo + - metodo +translation_of: Web/JavaScript/Reference/Global_Objects/Array/keys +--- +
{{JSRef}}
+ +

El método keys() devuelve un nuevo objeto  Array Iterator que contiene las claves de índice con las que acceder a cada elemento en el array.

+ +

{{EmbedInteractiveExample("pages/js/array-keys.html")}}

+ +

Sintaxis

+ +
arr.keys()
+ +

Valor de retorno

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Un nuevo objeto iterador {{jsxref("Array")}}.

+ +

Ejemplos

+ +

Uso básico

+ +
var arr = ['a', 'b', 'c'];
+var iterator = arr.keys();
+
+console.log(iterator.next()); // { value: 0, done: false }
+console.log(iterator.next()); // { value: 1, done: false }
+console.log(iterator.next()); // { value: 2, done: false }
+console.log(iterator.next()); // { value: undefined, done: true }
+
+ +

El iterador no ignora los huecos

+ +
var arr = ['a', , 'c'];
+var sparseKeys = Object.keys(arr);
+var denseKeys = [...arr.keys()];
+console.log(sparseKeys); // ['0', '2']
+console.log(denseKeys);  // [0, 1, 2]
+
+ +

Especificaciones

+ + + + + + + + + + + + + + + + + + + +
EspecificaciónEstadoComentario
{{SpecName('ES6', '#sec-array.prototype.keys', 'Array.prototype.keys')}}{{Spec2('ES6')}}Definición inicial.
{{SpecName('ESDraft', '#sec-array.prototype.keys', 'Array.prototype.keys')}}{{Spec2('ESDraft')}} 
+ +

Compatibilidad con navegadores

+ +
{{Compat("javascript.builtins.Array.keys")}}
+ +
 
+ +

Ver también

+ + -- cgit v1.2.3-54-g00ecf