JS: Set Constructor

(new in JS: ECMAScript 2015)

new Set()

Create a empty set.

new Set(iterable)

Create a set from values in Iterable Object iterable.

const xx = new Set([3, 4, 5])
console.log(xx)
// Set(3) { 3, 4, 5 }

Literal Expression for Set

There's no literal expression for set. But you can pass in a literal expression of array.

// using array as literal expression for set
const xx = new Set([3, 4, 5])
console.log(xx)
// Set(3) { 3, 4, 5 }

Example. Convert a string to a set

// string to set of chars
const xx = new Set("cat 😸")
xx.add("6")
console.log(xx)
// Set(6) { "c", "a", "t", " ", "😸", "6" }