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55 lines
2.3 KiB
55 lines
2.3 KiB
2 years ago
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import { Observable } from '../Observable';
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/**
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* Compares all values of two observables in sequence using an optional comparor function
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* and returns an observable of a single boolean value representing whether or not the two sequences
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* are equal.
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*
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* <span class="informal">Checks to see of all values emitted by both observables are equal, in order.</span>
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*
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* <img src="./img/sequenceEqual.png" width="100%">
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*
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* `sequenceEqual` subscribes to two observables and buffers incoming values from each observable. Whenever either
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* observable emits a value, the value is buffered and the buffers are shifted and compared from the bottom
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* up; If any value pair doesn't match, the returned observable will emit `false` and complete. If one of the
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* observables completes, the operator will wait for the other observable to complete; If the other
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* observable emits before completing, the returned observable will emit `false` and complete. If one observable never
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* completes or emits after the other complets, the returned observable will never complete.
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*
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* @example <caption>figure out if the Konami code matches</caption>
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* var code = Rx.Observable.from([
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* "ArrowUp",
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* "ArrowUp",
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* "ArrowDown",
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* "ArrowDown",
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* "ArrowLeft",
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* "ArrowRight",
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* "ArrowLeft",
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* "ArrowRight",
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* "KeyB",
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* "KeyA",
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* "Enter" // no start key, clearly.
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* ]);
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*
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* var keys = Rx.Observable.fromEvent(document, 'keyup')
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* .map(e => e.code);
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* var matches = keys.bufferCount(11, 1)
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* .mergeMap(
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* last11 =>
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* Rx.Observable.from(last11)
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* .sequenceEqual(code)
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* );
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* matches.subscribe(matched => console.log('Successful cheat at Contra? ', matched));
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*
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* @see {@link combineLatest}
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* @see {@link zip}
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* @see {@link withLatestFrom}
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*
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* @param {Observable} compareTo The observable sequence to compare the source sequence to.
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* @param {function} [comparor] An optional function to compare each value pair
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* @return {Observable} An Observable of a single boolean value representing whether or not
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* the values emitted by both observables were equal in sequence.
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* @method sequenceEqual
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* @owner Observable
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*/
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export declare function sequenceEqual<T>(this: Observable<T>, compareTo: Observable<T>, comparor?: (a: T, b: T) => boolean): Observable<boolean>;
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