Code coverage report for src/operator/skip.ts

Statements: 100% (20 / 20)      Branches: 100% (2 / 2)      Functions: 100% (7 / 7)      Lines: 100% (16 / 16)      Ignored: none     

All files » src/operator/ » skip.ts
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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);
    }
  }
}