57 lines
2.3 KiB
JavaScript
57 lines
2.3 KiB
JavaScript
|
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
|