js range

Array.apply(null, Array(5)).map(function (_, i) {return i;});
=> [0, 1, 2, 3, 4]

[...Array(5).keys()];
=> [0, 1, 2, 3, 4]
String.fromCharCode(..._.range('A'.charCodeAt(0), 'D'.charCodeAt(0) + 1));
=> "ABCD"