// begin lesson code
import { interval, fromEvent, of } from 'rxjs';
import { scan, mapTo, takeWhile, takeUntil, tap, startWith, endWith } from 'rxjs/operators';
/*
* CODE FOR FOR FIRST SECTION OF LESSON
*/
const numbers$ = of(1,2,3);
numbers$.pipe(
/*
* startWith lets you seed a stream with 1:M values.
* On subscription, these values will be emitted
* immediately, followed by any future values from
* the source.
*/
startWith('a', 'b', 'c'),
/*
* You can also end a stream with any number of values,
* emitted on completion.
*/
endWith('d', 'e', 'f')
).subscribe(console.log);
/*
a
b
c
1
2
3
d
e
f
*/
const countdown = document.getElementById('countdown');
const message = document.getElementById('message');
const abortButton = document.getElementById('abort');
// streams
const counter$ = interval(1000);
const abort$ = fromEvent(abortButton, 'click');
const COUNTDOWN_FROM = 10;
counter$
.pipe(
mapTo(-1),
scan((accumulator, current) => {
return accumulator + current;
}, COUNTDOWN_FROM),
takeWhile(value => value >= 0),
takeUntil(abort$),
/*
* With startWith, we can seed the stream with
* the starting countdown value.
*/
startWith(COUNTDOWN_FROM)
)
.subscribe((value: any) => {
countdown.innerHTML = value;
if (!value) {
message.innerHTML = 'Liftoff!';
}
});
原文地址:http://www.cnblogs.com/Answer1215/p/16816410.html
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