New Array Functions

// Array-like object (arguments) to Array function fooBar() { return Array.from(arguments); } fooBar(1, 2, 3, 5); // [1, 2, 3, 5]; // Any iterable object... // Set var s = new Set(["foo", window]); Array.from(s); // ["foo", window] // Map var m = new Map([[1, 2], [2, 4], [4, 8]]); Array.from(m); // [[1, 2], [2, 4], [4, 8]] // Using an arrow function as the map function to // manipulate the elements Array.from([1, 2, 3], x => x + x); // [2, 4, 6] // Array.fill allows you to replace all the elements of an array with the passed element var randomNumbers = [1, 5, 7, 77, 12, 3]; randomNumbers.fill('*'); // ['*', '*', '*', '*', '*', '*']; // Array.find receives a callback and returns the first element satisfying the condition in callback var users = [{name: 'John Doe', age: 23}, {name: 'Jane Doe', age: 25}, {name: 'Kane Doe', age: 30}]; users.find(user => user.age > 25); // {name: 'Kane Doe', age: 30} // Also a similar function is Array.findIndex which works the same but returns the index of the matching element instead.