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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.
js
new Map()
new Map(iterable)
Note:
Map() can only be constructed with new. Attempting to call it without new throws a TypeError.
iterable Optional-
If an iterable object (such as an array) is passed, all of its elements will be added to the new Map. Each element must be an object with two properties: 0 and 1, which correspond to the key and value (for example, [[1, "one"],[2, "two"]]). If you don't specify this parameter, or its value is null or undefined, the new Map is empty.
js
const myMap = new Map([
[1, "one"],
[2, "two"],
[3, "three"],
]);