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JavaScript Set Reference

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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.



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


const mySet = new Set();
const myObject = { a: 1, a: 5 };


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.

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

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 PropertiesDescriptionExample
sizeReturns the size of set
constructorUsed to create a new instance of set

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

Last Updated : 07 Jun, 2023
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