| import { Subscriber } from '../Subscriber'; |
| import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError'; |
| import { empty } from '../observable/empty'; |
| export function take(count) { |
| return (source) => { |
| if (count === 0) { |
| return empty(); |
| } |
| else { |
| return source.lift(new TakeOperator(count)); |
| } |
| }; |
| } |
| 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)); |
| } |
| } |
| class TakeSubscriber extends Subscriber { |
| constructor(destination, total) { |
| super(destination); |
| this.total = total; |
| this.count = 0; |
| } |
| _next(value) { |
| const total = this.total; |
| const count = ++this.count; |
| if (count <= total) { |
| this.destination.next(value); |
| if (count === total) { |
| this.destination.complete(); |
| this.unsubscribe(); |
| } |
| } |
| } |
| } |
| //# sourceMappingURL=take.js.map |