RxJS 5 mergeScan
RxJS 5 timeoutWith
never observable preventing concatenation.
wiki search with debounce
RxJS 5 filter
RxJS 5 take
No-Library (pure JS), HTML, CSS, JavaScript
RxJS 5 exhaustMap
RxJS 5 pairwise
RxJS 5 defer
RxJS 5 fromPromise