Map.prototype.size
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
La propiedad de acceso size
de las instancias Map
regresa el número de elementos de este map.
Pruébalo
const map1 = new Map();
map1.set("a", "alpha");
map1.set("b", "beta");
map1.set("g", "gamma");
console.log(map1.size);
// Expected output: 3
Descripción
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.
Ejemplos
Usando size
js
const myMap = new Map();
myMap.set("a", "alpha");
myMap.set("b", "beta");
myMap.set("g", "gamma");
console.log(myMap.size); // 3
Especificaciones
Specification |
---|
ECMAScript® 2025 Language Specification # sec-get-map.prototype.size |
Compatibilidad con nvegadores
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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size |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- See implementation notes.
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.