Ways to create a Set in JavaScript?

A set is an abstract data type that can store certain values, without any particular order, and no repeated values. It is a computer implementation of the mathematical concept of a finite set. Unlike most other collection types, rather than retrieving a specific element from a set, one typically tests a value for membership in a set.

Ways to create a set in js−

1. Using empty Set constructor

let mySet = new Set();
mySet.add(1);
mySet.add(1);
console.log(mySet)

Output

Set { 1 }

2. Passing an iterable to the constructor

The set constructor accepts an iterable object(list, set, etc) using which it constructs a new set.

Example

let mySet = new Set([1, 2, 1, 3, "a"]);
mySet.add(1);
mySet.add(1);
console.log(mySet)

Output

Set { 1, 2, 3, 'a' }

Ayush Gupta

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Updated on: 18-Sep-2019

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