Map() constructor

The Map() constructor creates Map objects.

Syntax

new Map()
new Map(iterable)

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.

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

Specification
ECMAScript Language Specification # sec-map-constructor

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