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import { Subscriber } from '../Subscriber';
import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
export function skipLast(count) {
    return (source) => source.lift(new SkipLastOperator(count));
}
class SkipLastOperator {
    constructor(_skipCount) {
        this._skipCount = _skipCount;
        if (this._skipCount < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    call(subscriber, source) {
        if (this._skipCount === 0) {
            return source.subscribe(new Subscriber(subscriber));
        }
        else {
            return source.subscribe(new SkipLastSubscriber(subscriber, this._skipCount));
        }
    }
}
class SkipLastSubscriber extends Subscriber {
    constructor(destination, _skipCount) {
        super(destination);
        this._skipCount = _skipCount;
        this._count = 0;
        this._ring = new Array(_skipCount);
    }
    _next(value) {
        const skipCount = this._skipCount;
        const count = this._count++;
        if (count < skipCount) {
            this._ring[count] = value;
        }
        else {
            const currentIndex = count % skipCount;
            const ring = this._ring;
            const oldValue = ring[currentIndex];
            ring[currentIndex] = value;
            this.destination.next(oldValue);
        }
    }
}
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