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.
Syntax
Parameters
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 newMap
.
Examples
Creating a new Map
js
const myMap = new Map([
[1, "one"],
[2, "two"],
[3, "three"],
]);
Specifications
Specification |
---|
ECMAScript® 2025 Language Specification # sec-map-constructor |
Browser compatibility
BCD tables only load in the browser