flatMapLatest not working

[Robin]

Hey! I can't seem to get flatMapLatest working (the console says it's not a valid function)

Sample code:

 Rx.Observable.create(observer => {
  setTimeout(() => observer.next(1), 500)
  setTimeout(() => observer.next(2), 2500)
  setTimeout(() => observer.next(3), 4500)
}).flatMap ( number => {
  return Rx.Observable.create(observer => {
	setTimeout(() => observer.next(number), 500)
	setTimeout(() => observer.next(number * 2), 1000)
	setTimeout(() => observer.next(number * 3), 1500)
  })
})

[Misha Moroshko]

flatMapLatest is not available in RxJS 5: Docs