A library that provides the missing Set methods such as map and filter.

Usage no npm install needed!

<script type="module">
  import superset from '';


superset NPM version Build Status Coverage Status

A library for ES6 that extends the built-in Set class to implement the missing fundamental methods such as map(), filter() and reduce() in addition to basic set methods such as union() and isSubsetOf().

Install from NPM

npm install superset --save


"use strict";

const SuperSet = require("superset");
const numbers = new SuperSet([1, 2, 3, 4, 5]);
const evenNumbers = numbers.filter(num => num % 2 === 0);  // SuperSet { 2, 4 }

evenNumbers.isSubsetOf(numbers);  // true

numbers.diff(evenNumbers);  // SuperSet { 1, 3, 5 }


You can check out the docs or refer to the Array methods on MDN for further information. The code is also documented using JSDoc.