Recursion - Sum Nested Array

Question

I\'m trying to sum a nested array [1,2,[3,4],[],[5]] without using loops but I don\'t see what\'s wrong with what I have so far.

function sumItem         


        

Answer 1

Here's a version without using loops:

function f(arr, i){
  if (i == arr.length)
    return 0;
	
  if (Array.isArray(arr[i]))
    return f(arr[i], 0) + f(arr, i + 1);
	  
  return arr[i] + f(arr, i + 1);
}

console.log(f([1,2,[3,4],[],[5]], 0));