es6/operator/every.js

import { Subscriber } from '../Subscriber';
/**
 * 返回的 Observable 发出是否源 Observable 的每项都满足指定的条件。
 *
 * @example <caption>一个简单示例：如果所有元素都小于5就发出 `true`，反之 `false`</caption>
 *  Observable.of(1, 2, 3, 4, 5, 6)
 *     .every(x => x < 5)
 *     .subscribe(x => console.log(x)); // -> false
 *
 * @param {function} predicate 用来确定每一项是否满足指定条件的函数。
 * @param {any} [thisArg] 可选对象，作为回调函数中的 `this` 使用。
 * @return {Observable} 布尔值的 Observable，用来确定是否源 Observable 的所有项都满足指定条件。
 * @method every
 * @owner Observable
 */
export function every(predicate, thisArg) {
    return this.lift(new EveryOperator(predicate, thisArg, this));
}
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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