Given an index and an array, return the value of the array with the given index.
value_at([1, 2, 3, 4, 5, 6], 10 / 2) ➞ 6 value_at([1, 2, 3, 4, 5, 6], 8.0 / 2) ➞ 5 value_at([1, 2, 3, 4], 6.535355314 / 2) ➞ 4
N/A