function get_products_of_all_ints_except_at_index(list) {
  return list.map((_, i) => list.reduce((p, y, j) => i === j ? p : p * y, 1));
}

console.log(get_products_of_all_ints_except_at_index([1, 7, 3, 4])); // [84, 12, 28, 21]