@reactivex/rxjs/dist/es6/operator/takeWhile.js

Reactive Extensions for modern JavaScript

import { Subscriber } from '../Subscriber';
/**
 * @param predicate
 * @return {Observable<R>|WebSocketSubject<T>|Observable<T>}
 * @method takeWhile
 * @owner Observable
 */
export function takeWhile(predicate) {
    return this.lift(new TakeWhileOperator(predicate));
}
class TakeWhileOperator {
    constructor(predicate) {
        this.predicate = predicate;
    }
    call(subscriber, source) {
        return source._subscribe(new TakeWhileSubscriber(subscriber, this.predicate));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class TakeWhileSubscriber extends Subscriber {
    constructor(destination, predicate) {
        super(destination);
        this.predicate = predicate;
        this.index = 0;
    }
    _next(value) {
        const destination = this.destination;
        let result;
        try {
            result = this.predicate(value, this.index++);
        }
        catch (err) {
            destination.error(err);
            return;
        }
        this.nextOrComplete(value, result);
    }
    nextOrComplete(value, predicateResult) {
        const destination = this.destination;
        if (Boolean(predicateResult)) {
            destination.next(value);
        }
        else {
            destination.complete();
        }
    }
}
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