iif

Using a predicate, decide which Observable to provide at the time of subscription

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
const { rxObserver } = require('api/v0.3');
const { iif, of } = require('rxjs');
// decides later which observable to return
const source$ = iif(
  ()=> Date.now() < 3 // predicate
  , of('🐦')          // true
  , of('🦉')          // false
);
// subsctibe at T0
source$.subscribe(rxObserver('Early bird'));
// delayed subscription
setTimeout(()=>{
  source$.subscribe(rxObserver('Night owl'));
}, 5);
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Download as PNG 

To switch between many Observables see defer function