Map.prototype.size

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

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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

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See also