instance method Array#reverse
Array#reverse([inline = true]) → Array- 
        inline(Boolean) – Whether to modify the array in place. Defaults totrue. Clones the original array whenfalse.
Reverses the array's contents, optionally cloning it first.
Examples
// Making a copy var nums = [3, 5, 6, 1, 20]; var rev = nums.reverse(false); // nums -> [3, 5, 6, 1, 20] // rev -> [20, 1, 6, 5, 3] // Working inline var nums = [3, 5, 6, 1, 20]; nums.reverse(); // nums -> [20, 1, 6, 5, 3]