work.suroh.tk/node_modules/rxjs/_esm2015/operators/every.js

64 lines
2.1 KiB
JavaScript

import { Subscriber } from '../Subscriber';
/**
* Returns an Observable that emits whether or not every item of the source satisfies the condition specified.
*
* @example <caption>A simple example emitting true if all elements are less than 5, false otherwise</caption>
* Observable.of(1, 2, 3, 4, 5, 6)
* .every(x => x < 5)
* .subscribe(x => console.log(x)); // -> false
*
* @param {function} predicate A function for determining if an item meets a specified condition.
* @param {any} [thisArg] Optional object to use for `this` in the callback.
* @return {Observable} An Observable of booleans that determines if all items of the source Observable meet the condition specified.
* @method every
* @owner Observable
*/
export function every(predicate, thisArg) {
return (source) => source.lift(new EveryOperator(predicate, thisArg, source));
}
class EveryOperator {
constructor(predicate, thisArg, source) {
this.predicate = predicate;
this.thisArg = thisArg;
this.source = source;
}
call(observer, source) {
return source.subscribe(new EverySubscriber(observer, this.predicate, this.thisArg, this.source));
}
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
class EverySubscriber extends Subscriber {
constructor(destination, predicate, thisArg, source) {
super(destination);
this.predicate = predicate;
this.thisArg = thisArg;
this.source = source;
this.index = 0;
this.thisArg = thisArg || this;
}
notifyComplete(everyValueMatch) {
this.destination.next(everyValueMatch);
this.destination.complete();
}
_next(value) {
let result = false;
try {
result = this.predicate.call(this.thisArg, value, this.index++, this.source);
}
catch (err) {
this.destination.error(err);
return;
}
if (!result) {
this.notifyComplete(false);
}
}
_complete() {
this.notifyComplete(true);
}
}
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