RXJS Operators
01 filter
02 isEmpty
03 max
04 min
05 reduce
06 count
07 tap
08 forkJoin
09 mergeMap
10 switchMap
11 first
12 last
13 take
14 takeLast
15 takeWhile
16 startWith
17 endWith
18 find
19 findIndex
20 distinct
21 from
22 range
23 interval
24 of
25 combineLatest
26 delay
27 concat
28 skip
29 skipLast
30 merge
31 partition
32 elementAt
33 distinctUntilChanged
34 ignoreElements
35 concatMap
36 exhaustMap
37 debounceTime
38 mapTo
39 pluck
40 pairwise
41 groupBy