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Map() - JavaScript | MDN
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  2. JavaScript
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Map()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 7.

Map() Map .

In this article

js
new Map()
new Map(iterable)

: Map() new . new TypeError .

iterable Optional

Array - . ( [[ 1, 'one' ],[ 2, 'two' ]] 2 ). - Map .

Map

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

Specification
ECMAScript 2027 LanguageSpecification
# sec-map-constructor

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  2. Map
    1. Map()
    1. Map.groupBy()
    1. Map[@@species]
    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]()
    1. Map.prototype.size
  9. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype[@@hasInstance]()
    1. Function: displayName
    2. Function.prototype.length
    3. Function: name
    4. Function
    5. Function.arguments
    6. Function.prototype.caller
    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()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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