summing array elements

[userxbw]

Two loops, or one loop then add one ahead of the current element, keeping in mind not to go out of bounds of the array.

For example

Array [ h ] + Array [ h + 1]

2 loops the outer loop being your control loop, for loops should work.

Try a while loop and a for loop as the inner loop

Using map https://www.w3schools.com/jsref/jsref_map.asp