JavaScript Set add()

Definition and usage

add() The method is used to insert a new element into the Set.

Instance

Example 1

letters.add("d");
letters.add("e");

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Example 2

If the same element is added, only the first one will be saved:

letters.add("a");
letters.add("b");
letters.add("c");
letters.add("c");
letters.add("c");
letters.add("c");
letters.add("c");
letters.add("c");

Try it yourself

Syntax

set.add(value)

Parameter

Return value

Browser support

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

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

Internet Explorer Does Not Support set.add().