11 Objects- Set

Details

Set object

The Set object is a collection of unique values, meaning that duplicate values are not allowed.

Set provides methods for adding, deleting, and checking the existence of values in the set.

Set can be used to remove duplicate values from arrays.

Useful - now to remove duplicates from an array

// How to remove duplicates from an array

let myArr = [1,4,3,4]

let mySet = new Set(myArray)


let uniqueArray = [...mySet]

// [1,4,3]

const uniqueNumbers = new Set()

uniqueNumbers.add(5)
uniqueNumbers.add(10)
uniqueNumbers.add(5)

console.log(uniqueNumbers)
// {5,10}

console.log(uniqueNumbers.size)
// 2

uniqueNumbers.has(10)
// true

uniqueNumbers.delete(10)
uniqueNumbers.size
// 1