Map.prototype.size
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
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
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