JavaScript new Map()

Definition and usage

new Map() The constructor is used to create Map objects.

Instance

Example 1

Through new Map() The constructor is used to create Map objects by passing an array to create a Map object:

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

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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 the 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 wird in Internet Explorer nicht unterstützt.