Function nestedAdd

specs/recursion/nested-arrays.solution.test.js:12–23

(array)

 */

function nestedAdd(array) {
  let sum = 0;
  for (let i = 0; i < array.length; i++) {
    const current = array[i];
    if (Array.isArray(current)) {
      sum += nestedAdd(current);
    } else {
      sum += current;
    }
  }
  return sum;
}

test("nested arrays addition", () => {
  expect(nestedAdd([1, 2, 3])).toEqual(6);