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function sumItems(array) {
  var sum = 0;
  for (var i = 0; i < array.length; i++) {
    if (Array.isArray(array[i])) {
      sum += sumItems(array[i]);
    } else {
      sum += array[i];
    }
  }
  return sum;
}

sumItems([1, [2, 3, [4]]]);

module.exports = sumItems;