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-import { innerFrom } from '../observable/innerFrom';
-import { MonoTypeOperatorFunction, ObservableInput } from '../types';
-import { operate } from '../util/lift';
-import { noop } from '../util/noop';
-import { createOperatorSubscriber } from './OperatorSubscriber';
-
-/**
- * Emits the most recently emitted value from the source Observable whenever
- * another Observable, the `notifier`, emits.
- *
- * <span class="informal">It's like {@link sampleTime}, but samples whenever
- * the `notifier` `ObservableInput` emits something.</span>
- *
- * ![](sample.png)
- *
- * Whenever the `notifier` `ObservableInput` emits a value, `sample`
- * looks at the source Observable and emits whichever value it has most recently
- * emitted since the previous sampling, unless the source has not emitted
- * anything since the previous sampling. The `notifier` is subscribed to as soon
- * as the output Observable is subscribed.
- *
- * ## Example
- *
- * On every click, sample the most recent `seconds` timer
- *
- * ```ts
- * import { fromEvent, interval, sample } from 'rxjs';
- *
- * const seconds = interval(1000);
- * const clicks = fromEvent(document, 'click');
- * const result = seconds.pipe(sample(clicks));
- *
- * result.subscribe(x => console.log(x));
- * ```
- *
- * @see {@link audit}
- * @see {@link debounce}
- * @see {@link sampleTime}
- * @see {@link throttle}
- *
- * @param notifier The `ObservableInput` to use for sampling the
- * source Observable.
- * @return A function that returns an Observable that emits the results of
- * sampling the values emitted by the source Observable whenever the notifier
- * Observable emits value or completes.
- */
-export function sample<T>(notifier: ObservableInput<any>): MonoTypeOperatorFunction<T> {
- return operate((source, subscriber) => {
- let hasValue = false;
- let lastValue: T | null = null;
- source.subscribe(
- createOperatorSubscriber(subscriber, (value) => {
- hasValue = true;
- lastValue = value;
- })
- );
- innerFrom(notifier).subscribe(
- createOperatorSubscriber(
- subscriber,
- () => {
- if (hasValue) {
- hasValue = false;
- const value = lastValue!;
- lastValue = null;
- subscriber.next(value);
- }
- },
- noop
- )
- );
- });
-}
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