In this section, we will learn what the add() method is and how to use it in JavaScript.

What is JavaScript Set add() Method?

When we want to add a new element into a `Set` object, we use the `add()` method.

JavaScript Set add() Method Syntax:

add(value)

add() Function Parameters:

This method takes one argument and assigns that to the target `Set` object.

Note: if the argument is already in the collection, the assignment will be ignored.

add() Function Return Value:

The returned value of this method is a reference to the Set object with the new value added.

Example: using Set add() method in JavaScript

const collect = new Set();

collect.add("Jack");

collect.add("Jack");

collect.add("Omid");

collect.add("John");

Note: in the second statement in the program, because the value `Jack` is already in the collection, the second statement won’t add another value `Jack` to the collection.