of(
  new Order('name', 'address 1', 1),
  new Order('name 1', 'address 2', 2),
  new Order('name 2', 'address 3', 3),
).pipe(
  filter((order: Order<string>) => order.id > 1),
  tap((order: Order<string>) => doSomethingWithOrder(order))
).subscribe((order: Order<string>) => {
  // do something with each order
})