@reactivex/rxjs/dist-compat/esm5/src/internal/operators/take.js

Reactive Extensions for modern JavaScript

var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
        return extendStatics(d, b);
    }
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
import { Subscriber } from '../Subscriber';
import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
import { empty } from '../observable/empty';
export function take(count) {
    return function (source) {
        if (count === 0) {
            return empty();
        }
        else {
            return source.lift(new TakeOperator(count));
        }
    };
}
var TakeOperator = (function () {
    function TakeOperator(total) {
        this.total = total;
        if (this.total < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    TakeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TakeSubscriber(subscriber, this.total));
    };
    return TakeOperator;
}());
var TakeSubscriber = (function (_super) {
    __extends(TakeSubscriber, _super);
    function TakeSubscriber(destination, total) {
        var _this = _super.call(this, destination) || this;
        _this.total = total;
        _this.count = 0;
        return _this;
    }
    TakeSubscriber.prototype._next = function (value) {
        var total = this.total;
        var count = ++this.count;
        if (count <= total) {
            this.destination.next(value);
            if (count === total) {
                this.destination.complete();
                this.unsubscribe();
            }
        }
    };
    return TakeSubscriber;
}(Subscriber));
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