JavaScript Set size

Definition and usage

size The property returns the number of elements in the Set.

Instance

// Create a Set
const letters = new Set(["a", "b", "c"]);
// Get the size of the Set
let x = letters.size;

Try it yourself

Syntax

set.size

Parameter

None.

Return value

Browser support

set.size Is a feature of ECMAScript6 (ES6).

Since June 2017, all modern browsers support ES6 (JavaScript 2015):

Internet Explorer Does Not Support set.size.