Range The function range works like the version from Python, generating a range of numbers in the form of an array. range(1, 11); //[1, 2, 3, 4, 5, 6, 7, 8, 9, 10] range(1, 11, 2); //[1, 3, 5, 7, 9] range(10, 5, -1); //[10, 9, 8, 7, 6] range(5); //[0, 1, 2, 3, 4]