function someDemo(orders) {
  const ordersMoreThanEqualToQuantity30Exists = orders.some(
    order => order.quantity >= 30
  );
  WriteLine(
    `Are there orders with quantity great than and equal to 30? ${ordersMoreThanEqualToQuantity30Exists}`
  );

  const ordersBeforeYear2018 = orders.some(
    order => order.orderDate.getFullYear() < 2018
  );
  WriteLine(`Are there orders ordered before 2018? ${ordersBeforeYear2018}`);

  const ordersWithIDGreaterThan100 = orders.some(order => order.id > 100);
  WriteLine(`Do we have more than 100 Orders? ${ordersWithIDGreaterThan100}`);
}