Is there a library for a Set data type in Javascript?

Question

Since Javascript doesn\'t have a built in set datatype has anyone come across a decent library for sets and set operations like union, intersection, etc?

Answer 1

immutable-js expose a powerfull set data-structure.

A simple example for node.js, which you can see in work here.

im = require("immutable")

const mySet = im.Set([1, "a", {value: Symbol()}])

// the .add and .delete methods do not modify mySet, but return a new set instance instead.
const newSet = mySet
                .add(42)
                .delete(1)

console.info("Does mySet have 42?", mySet.has(42))
console.info("Does newSet have 42?", newSet.has(42))