JavaScript Set Reference

Last Updated : 07 Jun, 2023

JavaScript Set is a collection of items that are unique i.e. no element can be repeated. Elements of the set can be iterated in the insertion order. A set can store any type of value whether primitive or objects.

Syntax:

Set.function()

Example: This example will show the use of Set() constructor.

Javascript

const mySet = new Set(); 
  
mySet.add("California"); 
mySet.add("India"); 
mySet.add("California"); 
mySet.add(10); 
mySet.add(10); 
  
const myObject = { a: 1, a: 5 }; 
  
mySet.add(myObject); 
  
console.log(mySet); 

Output:

Set(4) { 'California', 'India', 10, { a: 5 } }

The complete list of JavaScript Set has listed below:

JavaScript Set Constructor: A constructor gets called when an object is created using the new keyword.

Constructor	Description	Example
Set()	Create a set of unique values of any type, whether primitive values or object preferences.	Try

JavaScript Set Properties: A JavaScript property is a member of an object that associates a key with a value.

Instance Property: An instance property is a property that has a new copy for every new instance of the class.

Instance Properties	Description	Example
size	Returns the size of set	Try
constructor	Used to create a new instance of set	Try

JavaScript Set Methods: Methods are actions that can be performed on objects.

Instance Method: If the method is called on an instance of a Set then it is called an instance method.

Instance Methods	Description	Example
add()	Add an element to the set with the specified value	Try
clear()	Removes all the elements from the set	Try
delete()	Delete specified element if it exists in the set	Try
entries()	Used to iterate over each element of the set	Try
forEach()	Applies a function on each element of the set	Try
has()	Checks if a particular element exists in the set	Try
values()	Returns an iterator that contains all elements of the set	Try
keys()	Exactly equivalent to the values method	Try

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