1var foo = new Array(100).fill('DefaultValue');

1Array.from(Array(10).keys())
2//=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

1function range(start, end) {
2  return Array(end - start + 1).fill().map((_, idx) => start + idx)
3}
4var result = range(9, 18); // [9, 10, 11, 12, 13, 14, 15, 16, 17, 18]
5console.log(result);

1var foo = new Array(45); // create an empty array with length 45
2