JavaScript Set add() Method (original) (raw)

Last Updated : 12 Jul, 2024

The **Set.add() method in JavaScript is used to append an element with a specified value in a set. It modifies the existing set by appending the new element but does not return a new set. The **Set.add() method does not modify the set if the element with a specified value already exists in the set.

**Syntax:

mySet.add(value);

**Parameters:

****value:**It is the value of the new element that is about to get appended to our set.

**Return value:

It returns the set object with an added value

**Example 1: In this example, we have added two numbers 23 and 12 into the set.

JavaScript `

// Create a new set using Set() constructor let myset = new Set();

// Append new elements to the // set using add() method myset.add(23); myset.add(12);

// Print the modified set console.log(myset);

**Example 2: Adding elements using add() with chaining and checking if duplicate values exist or not.

JavaScript `

// Create a new set using Set() constructor let myset = new Set();

// Append new elements to the set // using add() method with chaining myset.add(23).add(12);

// Appending an already existing // element to the set this // element will not be added to the set // as it contains only distinct elements myset.add(23);