work.suroh.tk/node_modules/rxjs/_esm2015/operator/sequenceEqual.js

57 lines
2.3 KiB
JavaScript
Raw Normal View History

2019-12-02 12:22:45 +00:00
import { sequenceEqual as higherOrder } from '../operators/sequenceEqual';
/**
* Compares all values of two observables in sequence using an optional comparor function
* and returns an observable of a single boolean value representing whether or not the two sequences
* are equal.
*
* <span class="informal">Checks to see of all values emitted by both observables are equal, in order.</span>
*
* <img src="./img/sequenceEqual.png" width="100%">
*
* `sequenceEqual` subscribes to two observables and buffers incoming values from each observable. Whenever either
* observable emits a value, the value is buffered and the buffers are shifted and compared from the bottom
* up; If any value pair doesn't match, the returned observable will emit `false` and complete. If one of the
* observables completes, the operator will wait for the other observable to complete; If the other
* observable emits before completing, the returned observable will emit `false` and complete. If one observable never
* completes or emits after the other complets, the returned observable will never complete.
*
* @example <caption>figure out if the Konami code matches</caption>
* var code = Rx.Observable.from([
* "ArrowUp",
* "ArrowUp",
* "ArrowDown",
* "ArrowDown",
* "ArrowLeft",
* "ArrowRight",
* "ArrowLeft",
* "ArrowRight",
* "KeyB",
* "KeyA",
* "Enter" // no start key, clearly.
* ]);
*
* var keys = Rx.Observable.fromEvent(document, 'keyup')
* .map(e => e.code);
* var matches = keys.bufferCount(11, 1)
* .mergeMap(
* last11 =>
* Rx.Observable.from(last11)
* .sequenceEqual(code)
* );
* matches.subscribe(matched => console.log('Successful cheat at Contra? ', matched));
*
* @see {@link combineLatest}
* @see {@link zip}
* @see {@link withLatestFrom}
*
* @param {Observable} compareTo The observable sequence to compare the source sequence to.
* @param {function} [comparor] An optional function to compare each value pair
* @return {Observable} An Observable of a single boolean value representing whether or not
* the values emitted by both observables were equal in sequence.
* @method sequenceEqual
* @owner Observable
*/
export function sequenceEqual(compareTo, comparor) {
return higherOrder(compareTo, comparor)(this);
}
//# sourceMappingURL=sequenceEqual.js.map