Map.prototype.size

The size accessor property of Map instances returns the number of elements in this map.

Try it

Description

The value of size is an integer representing how many entries the Map object has. A set accessor function for size is undefined; you can not change this property.

Examples

Using size

js

const myMap = new Map();
myMap.set("a", "alpha");
myMap.set("b", "beta");
myMap.set("g", "gamma");

console.log(myMap.size); // 3

Specifications

Specification
ECMAScript Language Specification
# sec-get-map.prototype.size

Browser compatibility

BCD tables only load in the browser

See also