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

This is similar to some of the other solutions but might be easier for some to read:

 function Sum(arr) {
   if (!arr.length) return 0;
   if (Array.isArray(arr[0])) return Sum(arr[0]) + Sum(arr.slice(1));
   return arr[0] + Sum(arr.slice(1));
 }

 console.log(Sum([[1],2,[3,[4,[5,[6,[7,[8,9,10],11,[12]]]]]]])) // 78