JavaScript Map size Property

Map is a collection of elements where each element is stored as a Key, value pair. Map.size property is used to return the number of Key, and value pairs stored in a map.

Syntax:

mapName.size

Return Value: An integer representing number of Key, value pair stored in a map.

The examples below illustrate the Map.size property:

Example 1:

Javascript

let GFGmap = new Map();

// Adding key, value pairs to the map
GFGmap.set('1', 'Apple');
GFGmapset('2', 'Banana');
GFGmap.set('3', 'Mango');

// Printing number of key, value
// pairs stored in the map
console.log(GFGmap.size);

Output:

3

Example 2:

Javascript

let GFGmap = new Map();

// Adding key, value pairs to the map
GFGmap.set('a', 'Apple');
GFGmapset('b', 'Ball');
GFGmap.set('c', 'Cat');
GFGmap.set('d', 'Dog');

// Printing number of key, value
// pairs stored in the map
console.log(GFGmap.size);

Output:

4

Supported Browsers:

• Google Chrome 38.0
• Microsoft Edge 12.0
• Firefox 13.0
• Internet Explorer 11.0
• Opera 25.0
• Safari 8.0

We have a complete list of Javascript Map methods, to check those please go through this JavaScript Map Complete Reference article.