Question

The sum of the elements of an integer-valued array recursively calculated as follows: The sum of an array of size 0 is 0; Otherwise, the sum is the value of the first element added to the sum of the rest of the array. Write an int-valued function named sum that accepts an integer array, and the number of elements in the array and returns the sum of the elements of the array.

Answer 1

In what language? Most languages have iterator functions like map in JavaScript that will loop through the elements, making this almost a one liner

sum = 0
arr.map( elem => sum += elem )