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import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { Observable } from '../Observable';
import { TeardownLogic } from '../Subscription';
import { MonoTypeOperatorFunction } from '../interfaces';
/**
* Returns an Observable that skips the first `count` items emitted by the source Observable.
*
* <img src="./img/skip.png" width="100%">
*
* @param {Number} count - The number of times, items emitted by source Observable should be skipped.
* @return {Observable} An Observable that skips values emitted by the source Observable.
*
* @method skip
* @owner Observable
*/
export function skip<T>(count: number): MonoTypeOperatorFunction<T> {
return (source: Observable<T>) => source.lift(new SkipOperator(count));
}
class SkipOperator<T> implements Operator<T, T> {
constructor(private total: number) {
}
call(subscriber: Subscriber<T>, source: any): TeardownLogic {
return source.subscribe(new SkipSubscriber(subscriber, this.total));
}
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
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);
}
}
}