find max array

function findMax(arr) {
  if (arr.length === 0) return 0;
  var max = arr[0];
  for (var i = 0; i < arr.length; i++) {
    if (arr[i] > max) {
      max = arr[i];
    }
  }
  return max;
}

findMax([1, 2, 3]);