JavaScript new Map()

Course recommendation:

new Map() Definition and usage

to construct.

Instance

Example 1 new Map() Constructor is used to create Map objects by passing an array to:

// Create a Map
const fruits = new Map([
  ["apples", 500],
  ["bananas", 300],
  ["oranges", 200]
]);

Try it yourself

Example 2

Create a new Map object and use set() Method to add elements:

// Create a Map
const fruits = new Map();
// Set the value of Map
fruits.set("apples", 500);
fruits.set("bananas", 300);
fruits.set("oranges", 200);

Try it yourself

Syntax

Parameter

Return value

Browser support

Map is a feature of ECMAScript6 (ES6).

Starting from June 2017, all modern browsers support ES6 (JavaScript 2015):

Map is not supported in Internet Explorer.