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files/es/web/javascript/reference/global_objects/map/foreach/index.md
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| --- | ||
| title: Map.prototype.forEach() | ||
| slug: Web/JavaScript/Reference/Global_Objects/Map/forEach | ||
| l10n: | ||
| sourceCommit: 27180875516cc311342e74b596bfb589b7211e0c | ||
| --- | ||
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| {{JSRef}} | ||
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| El método **`forEach()`** de las instancias de {{jsxref("Map")}} ejecuta la función provista, una vez por cada tupla llave/valor en este _map_, en orden de inserción. | ||
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| {{EmbedInteractiveExample("pages/js/map-prototype-foreach.html")}} | ||
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| ## Sintaxis | ||
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| ```js-nolint | ||
| forEach(callbackFn) | ||
| forEach(callbackFn, thisArg) | ||
| ``` | ||
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| ### Parámetro | ||
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| - `callbackFn` | ||
| - : Una función que se ejecuta por cada entrada en el _map_. La función es llamada con los siguientes argumentos: | ||
| - `value` | ||
| - : El valor de cada iteración. | ||
| - `key` | ||
| - : La llave de cada iteración. | ||
| - `map` | ||
| - : El _map_ que esta siendo iterado. | ||
| - `thisArg` {{optional_inline}} | ||
| - : Un valor que se usa como `this` cuando se ejecuta la función `callbackFn`. | ||
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| ### Valor devuelto | ||
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| Ningúno ({{jsxref("undefined")}}). | ||
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| ## Descripción | ||
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| El método `forEach` ejecuta la función `callback` provista, una vez por cada llave que actualmente existe en el _map_. No se invoca para llaves que fueron borradas. Sin embargo, la función es ejecutada para valores que se encuentran en el objeto, pero que su valor es `undefined`. | ||
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| La función `callback` es invocada con **tres argumentos**: | ||
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| - el `value` del elemento | ||
| - el `key` del elemento | ||
| - el **objeto `Map`** que se esta iterando | ||
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| Si el parámetro `thisArg` se provee a la función `forEach`, este se pasará a la función `callback` cuando sea invocada, para usarse como el valor `this`. De lo contrario, el valor `undefined` será pasado para usarse como el valor `this`. El valor `this` que finalmente es visible para la función `callback`, es determinado de acuerdo a [las reglas para determinar el valor `this` visible para una función](/es/docs/Web/JavaScript/Reference/Operators/this). | ||
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| Cada valor es visitado una vez, excepto en el caso en que el valor es borrado y agregado antes de que `forEach` haya terminado. La función `callback` no es invocada para valores que se borraron antes de ser visitados. Los valores agregados antes de que `forEach` termine, serán visitados. | ||
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| ## Ejemplos | ||
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| ### Imprimiendo el contenido de un objeto Map | ||
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| El siguiente código, registra en la consola un mensaje por cada elemento en un objeto `Map`: | ||
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| ```js | ||
| function logMapElements(value, key, map) { | ||
| console.log(`map.get('${key}') = ${value}`); | ||
| } | ||
| new Map([ | ||
| ["foo", 3], | ||
| ["bar", {}], | ||
| ["baz", undefined], | ||
| ]).forEach(logMapElements); | ||
| // Logs: | ||
| // "map.get('foo') = 3" | ||
| // "map.get('bar') = [object Object]" | ||
| // "map.get('baz') = undefined" | ||
| ``` | ||
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| ## Especificaciones | ||
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| {{Specifications}} | ||
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| ## Compatibilidad con navegadores | ||
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| {{Compat}} | ||
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| ## Véase también | ||
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| - {{jsxref("Array.prototype.forEach()")}} | ||
| - {{jsxref("Set.prototype.forEach()")}} |
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files/es/web/javascript/reference/global_objects/map/size/index.md
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| --- | ||
| title: Map.prototype.size | ||
| slug: Web/JavaScript/Reference/Global_Objects/Map/size | ||
| l10n: | ||
| sourceCommit: 6a0f9553932823cd0c4dcf695d4b4813474964fb | ||
| --- | ||
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| {{JSRef}} | ||
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| La propiedad de acceso **`size`** de las instancias {{jsxref("Map")}} regresa el número de elementos de este _map_. | ||
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| {{EmbedInteractiveExample("pages/js/map-prototype-size.html")}} | ||
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| ## Descripción | ||
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| El valor de `size` es un entero que representa, el número de entradas que el objeto `Map` tiene. La función de acceso para `size` es `undefined`; no puedes modificar esta propiedad. | ||
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| ## Ejemplos | ||
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| ### Usando size | ||
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| ```js | ||
| const myMap = new Map(); | ||
| myMap.set("a", "alpha"); | ||
| myMap.set("b", "beta"); | ||
| myMap.set("g", "gamma"); | ||
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| console.log(myMap.size); // 3 | ||
| ``` | ||
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| ## Especificaciones | ||
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| {{Specifications}} | ||
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| ## Compatibilidad con nvegadores | ||
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| {{Compat}} | ||
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| ## Véase también | ||
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| - {{jsxref("Map")}} |
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...s/ko/web/http/resources_and_uris/index.md → ...b/http/basics_of_http/mime_types/index.md
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...identifying_resources_on_the_web/index.md → ...identifying_resources_on_the_web/index.md
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...ing_between_www_and_non-www_urls/index.md → ...ing_between_www_and_non-www_urls/index.md
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...eb/http/basics_of_http/data_urls/index.md → files/ko/web/uri/schemes/data/index.md
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...ttp/basics_of_http/resource_urls/index.md → files/ko/web/uri/schemes/resource/index.md
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...identifying_resources_on_the_web/index.md → ...identifying_resources_on_the_web/index.md
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...eb/http/basics_of_http/data_urls/index.md → files/ru/web/uri/schemes/data/index.md
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| --- | ||
| title: Data URL | ||
| slug: Web/HTTP/Basics_of_HTTP/Data_URLs | ||
| slug: Web/URI/Schemes/data | ||
| --- | ||
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| {{HTTPSidebar}} | ||
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