Array.from(Array(10).keys()) //=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] [...Array(10).keys()] //=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] Array.from({length: 10}, (_, i) => i + 1) //=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]