The size
accessor property returns the number of elements in a Set
object.
Description
The value of size
is an integer representing how many entries the Set
object has. A set accessor function for size
is undefined
; you cannot change this property.
Examples
Using size
var mySet = new Set(); mySet.add(1); mySet.add(5); mySet.add('some text') mySet.size; // 3
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Set.prototype.size' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of 'Set.prototype.size' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 38 | 12 | 191 | 11 | 25 | 8 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 38 | 38 | 12 | 191 | 11 | 25 | 8 |
1. From Firefox 13 to Firefox 18, the size
property was implemented as a Set.prototype.size()
method, this has been changed to a property in later versions conform to the ECMAScript 2015 specification.