source: trip-planner-front/node_modules/rxjs/src/internal/operators/timestamp.ts

Last change on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1
2import { async } from '../scheduler/async';
3import { OperatorFunction, SchedulerLike, Timestamp as TimestampInterface } from '../types';
4import { map } from './map';
5
6/**
7 * Attaches a timestamp to each item emitted by an observable indicating when it was emitted
8 *
9 * The `timestamp` operator maps the *source* observable stream to an object of type
10 * `{value: T, timestamp: R}`. The properties are generically typed. The `value` property contains the value
11 * and type of the *source* observable. The `timestamp` is generated by the schedulers `now` function. By
12 * default it uses the *async* scheduler which simply returns `Date.now()` (milliseconds since 1970/01/01
13 * 00:00:00:000) and therefore is of type `number`.
14 *
15 * ![](timestamp.png)
16 *
17 * ## Example
18 *
19 * In this example there is a timestamp attached to the documents click event.
20 *
21 * ```ts
22 * import { fromEvent } from 'rxjs';
23 * import { timestamp } from 'rxjs/operators';
24 *
25 * const clickWithTimestamp = fromEvent(document, 'click').pipe(
26 * timestamp()
27 * );
28 *
29 * // Emits data of type {value: MouseEvent, timestamp: number}
30 * clickWithTimestamp.subscribe(data => {
31 * console.log(data);
32 * });
33 * ```
34 *
35 * @param scheduler
36 * @return {Observable<Timestamp<any>>|WebSocketSubject<T>|Observable<T>}
37 * @method timestamp
38 * @owner Observable
39 */
40export function timestamp<T>(scheduler: SchedulerLike = async): OperatorFunction<T, Timestamp<T>> {
41 return map((value: T) => new Timestamp(value, scheduler.now()));
42 // return (source: Observable<T>) => source.lift(new TimestampOperator(scheduler));
43}
44
45export class Timestamp<T> implements TimestampInterface<T> {
46 constructor(public value: T, public timestamp: number) {
47 }
48}
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