@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
63 lines • 2.01 kB
JavaScript
;
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var Subscriber_1 = require('../Subscriber');
var ArgumentOutOfRangeError_1 = require('../util/ArgumentOutOfRangeError');
var EmptyObservable_1 = require('../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
*/
function take(total) {
if (total === 0) {
return new EmptyObservable_1.EmptyObservable();
}
else {
return this.lift(new TakeOperator(total));
}
}
exports.take = take;
var TakeOperator = (function () {
function TakeOperator(total) {
this.total = total;
if (this.total < 0) {
throw new ArgumentOutOfRangeError_1.ArgumentOutOfRangeError;
}
}
TakeOperator.prototype.call = function (subscriber, source) {
return source._subscribe(new TakeSubscriber(subscriber, this.total));
};
return TakeOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var TakeSubscriber = (function (_super) {
__extends(TakeSubscriber, _super);
function TakeSubscriber(destination, total) {
_super.call(this, destination);
this.total = total;
this.count = 0;
}
TakeSubscriber.prototype._next = function (value) {
var total = this.total;
if (++this.count <= total) {
this.destination.next(value);
if (this.count === total) {
this.destination.complete();
this.unsubscribe();
}
}
};
return TakeSubscriber;
}(Subscriber_1.Subscriber));
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