import {Operator} from '../Operator';
import {Subscriber} from '../Subscriber';
import {Observable} from '../Observable';
/**
* Returns an Observable that skips `n` items emitted by an Observable.
*
* <img src="./img/skip.png" width="100%">
*
* @param {Number} the `n` of times, items emitted by source Observable should be skipped.
* @returns {Observable} an Observable that skips values emitted by the source Observable.
*
*/
export function skip<T>(total: number): Observable<T> {
return this.lift(new SkipOperator(total));
}
class SkipOperator<T> implements Operator<T, T> {
constructor(private total: number) {
}
call(subscriber: Subscriber<T>): Subscriber<T> {
return new SkipSubscriber(subscriber, this.total);
}
}
class SkipSubscriber<T> extends Subscriber<T> {
count: number = 0;
constructor(destination: Subscriber<T>, private total: number) {
super(destination);
}
protected _next(x: T) {
if (++this.count > this.total) {
this.destination.next(x);
}
}
}
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