arrayFrom.js

// Say you have an Iterable that you want to turn into an array
const map = new Map()
map.set('a', 1);
map.set('b', 2);
// Array.from has you covered!
const twoDArr = Array.from(map); // [['a', 1], ['b', 2]]

// Not only can Array.from handle Maps, it can create brand new arrays
const emptyArr = Array.from({length: 3}); // [blank, blank, blank];

// And as a second argument, it even accepts a map function
const toThreeArr = Array.from({length: 3}, (_, i) => i); // [0, 1, 2]

// You can easily make a "range" function from it!
const range = (from, to) => Array.from({length: (to - from) + 1}, (_, i) => i + from);

range(10, 15); // [10, 11, 12, 13, 14, 15]