Problema somma array

function fn (min, max, array, num) {
  if (min === max ) { return false; }
  const tot = array[min] + array[max];
  if (tot === num) {
    return true;
  } else if (tot < num) {
    return fn (min + 1, max, array, num);
  } else {
    return fn (min, max - 1, array, num);
  } // if - else
} // fn