What's missing in this code?
// getNestedArrayLength([1, [2, [3, [4, [5, 6]]]]]); // -> 6
// getNestedArrayLength([1, [[2, [3, [4, 5]]]]]); // -> 5
// getNestedArrayLength([1, [2, 3], [[4]]]); // -> 3
function getNestedArrayLength(array) 
  let sum = 0;
  for (let count = 0; count < array.length; count++) 
    if (Array.isArray(array[count])) 
      sum += 
(array[count]);
    } else 
;
    }
  }
  return 
;
}
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