Map() constructor

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.

The Map() constructor creates Map objects.

new Map()
new Map(iterable)

Note: Map() can only be constructed with new. Attempting to call it without new throws a TypeError.

iterable Optional: An Array or other iterable object whose elements are key-value pairs. (For example, arrays with two elements, such as [[ 1, 'one' ],[ 2, 'two' ]].) Each key-value pair is added to the new Map.

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

Specification
ECMAScript Language Specification # sec-map-constructor

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