[RxJS] Filtering Operator:single, race

Single, race both get only one emit value from the stream.

Single (FN):

Const Source = Rx.Observable.from ([1,2,3,4,5]); var single = Source.single (x = = = = 3); /* (12345) |                   (source) Single (x = = = = 3) 3|                         (single) */ var sub = single.subscribe (x =  //  3

Race (... observable): observable

Const WINNER =Rx.Observable.race (//emit every 1.5sRx.Observable.interval (1500),  //emit every 1sRx.Observable.interval (+) mapto (' 1s won! '),  //emit every 2sRx.Observable.interval (2000),  //emit every 2.5sRx.Observable.interval (2500). Take (1);/**------0 (Mapto)----0 (1s won! ')          --------0 (a)----------0 (2500) race----(1s won!) | (Take (1))*/Const SUB2= Winner.subscribe (x = Console.log (x));//1s won!

[RxJS] Filtering Operator:single, race