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Map() constructor - JavaScript | MDN
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  1. Tecnologia Web para desenvolvedores
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  6. Map() constructor
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Map() constructor

Baseline Widely available

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

O construtor Map() cria objetos Map.

In this article

Sintaxe

js
new Map();
new Map(iterable);

Parmetros

iterable Optional

Um Array ou outro objeto itervel dos quais os elementos so pares chave-valor. (Por exemplo, arrays com dois elementos como [[ 1, 'one' ],[ 2, 'two' ]].). Cada par chave-valor adicionado ao novo Map.

Exemplos

Criando um novo Map

js
let myMap = new Map([
  [1, "one"],
  [2, "two"],
  [3, "three"],
]);

Especificaes

Specification
ECMAScript 2027 LanguageSpecification
# sec-map-constructor

Compatibilidade com navegadores

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  1. Objetos Globais
  2. Map
  3. Construtor
    1. Map() constructor
  4. Mtodos estticos
    1. groupBy()
  5. Propriedades estticas
    1. get Map[@@species]
  6. Mtodos de instncia
    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[@@iterator]()
  7. Propriedades de instncia
    1. Map.prototype.size
  8. Herana
  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. Propriedades estticas
    1. Function.displayName
    2. Function.length
    3. Function.name
    4. prototype
    5. Function.arguments
    6. Function.caller
  12. Mtodos de instncia
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__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. Propriedades de instncia
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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