JavaScript Sets

JavaScript Sets

 

In this tutorial, you will learn about the JavaScript Set object provided by ES6 (Ecmascript 6). A set is a collection of items which are unique i.e., no element can be repeated. Sets in ES6 are ordered: elements of the set can be iterated in the insertion order. Set can store any types of values whether primitive or objects. 

 

Set Methods

Method	Description
new Set()	Creates a new Set
add()	Adds a new element to the Set
delete()	Removes an element from a Set
has()	Returns true if a value exists
clear()	Removes all elements from a Set
forEach()	Invokes a callback for each element
values()	Returns an Iterator with all the values in a Set
keys()	Same as values()
entries()	Returns an Iterator with the [value,value] pairs from a Set

The Syntax of the JavaScript Set is as follows:

new Set([it]);

 

Example1 – Pass an Array to the new Set() constructor: 

Output

Example2 - Add values to a set Create a Set and add literal values:

Output