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

Reactive Extensions for modern JavaScript

import { Subscriber } from '../Subscriber';
import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
import { EmptyObservable } from '../observable/EmptyObservable';
/**
 * @throws {ArgumentOutOfRangeError} When using `take(i)`, it delivers an
 * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
 * @param total
 * @return {any}
 * @method take
 * @owner Observable
 */
export function take(total) {
    if (total === 0) {
        return new EmptyObservable();
    }
    else {
        return this.lift(new TakeOperator(total));
    }
}
class TakeOperator {
    constructor(total) {
        this.total = total;
        if (this.total < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    call(subscriber, source) {
        return source._subscribe(new TakeSubscriber(subscriber, this.total));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class TakeSubscriber extends Subscriber {
    constructor(destination, total) {
        super(destination);
        this.total = total;
        this.count = 0;
    }
    _next(value) {
        const total = this.total;
        if (++this.count <= total) {
            this.destination.next(value);
            if (this.count === total) {
                this.destination.complete();
                this.unsubscribe();
            }
        }
    }
}
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