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 added value
The examples below illustrate the add() method:
Example 1:
Javascript
// Create a new set using Set() constructorlet myset = new Set();Â
// Append new elements to the // set using add() methodmyset.add(23);myset.add(12);Â
// Print the modified setconsole.log(myset); |
Output:
Set(2) { 23, 12 }
Example 2: Adding elements using add() with chaining and checking if duplicate values exists or not.
Javascript
// Create a new set using Set() constructorlet myset = new Set();Â
// Append new elements to the set // using add() method with chainingmyset.add(23).add(12);Â
// Appending an already existing // element to the set this// element will not be added to the set // as it contains only distinct elementsmyset.add(23);Â
// Print the modified setconsole.log(myset); |
 Output:
Set(2) { 23, 12 }
Supported Browsers:
- Chrome 38 and above
- Edge 12 and above
- Firefox 24 and above
- Opera 25 and above
- Safari 8 and above
We have a complete list of Javascript Set methods, to check those please go through this Sets in JavaScript article.
We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript. Â
