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Map.prototype.size - JavaScript | MDN
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Map.prototype.size

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since julio de 2015.

La propiedad de acceso size de las instancias Map regresa el nmero de elementos de este map.

In this article

Prubalo

const map1 = new Map();

map1.set("a", "alpha");
map1.set("b", "beta");
map1.set("g", "gamma");

console.log(map1.size);
// Expected output: 3

Descripcin

El valor de size es un entero que representa, el nmero de entradas que el objeto Map tiene. La funcin 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 2027 LanguageSpecification
# sec-get-map.prototype.size

Compatibilidad con nvegadores

Vase tambin

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  1. Objetos globales
  2. Map
  3. Constructor
    1. Map() constructor
  4. Mtodos estticos
    1. Map.groupBy()
  5. Propiedades estticas
    1. Map[Symbol.species]
  6. Mtodos de instancia
    1. Map.prototype.clear()
    2. Map.prototype.delete()
    3. Map.prototype.entries()
    4. Map.prototype.forEach()
    5. Map.prototype.get()
    6. getOrInsert()
    7. getOrInsertComputed()
    8. Map.prototype.has()
    9. Map.prototype.keys()
    10. Map.prototype.set()
    11. Map.prototype.values()
    12. Map.prototype[Symbol.iterator]()
  7. Propiedades de instancia
    1. Map.prototype.size
  8. Herencia
  9. Object/Function
  10. Mtodos estticos
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toString()
    5. [Symbol.hasInstance]()
  11. Propiedades estticas
    1. Function.displayName
    2. Function.length
    3. Function.name
    4. prototype
    5. Function.prototype.arguments
    6. Function.caller
  12. Mtodos de instancia
    1. Object.prototype.__defineGetter__()
    2. __defineSetter__()
    3. __lookupGetter__()
    4. __lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
  13. Propiedades de instancia
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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