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Viewing file:     skipLast.js (3.24 KB)      -rwxrwxr-x

"use strict";
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var Subscriber_1 = require('../Subscriber');
var ArgumentOutOfRangeError_1 = require('../util/ArgumentOutOfRangeError');
/**
 * Skip the last `count` values emitted by the source Observable.
 *
 * <img src="./img/skipLast.png" width="100%">
 *
 * `skipLast` returns an Observable that accumulates a queue with a length
 * enough to store the first `count` values. As more values are received,
 * values are taken from the front of the queue and produced on the result
 * sequence. This causes values to be delayed.
 *
 * @example <caption>Skip the last 2 values of an Observable with many values</caption>
 * var many = Rx.Observable.range(1, 5);
 * var skipLastTwo = many.skipLast(2);
 * skipLastTwo.subscribe(x => console.log(x));
 *
 * // Results in:
 * // 1 2 3
 *
 * @see {@link skip}
 * @see {@link skipUntil}
 * @see {@link skipWhile}
 * @see {@link take}
 *
 * @throws {ArgumentOutOfRangeError} When using `skipLast(i)`, it throws
 * ArgumentOutOrRangeError if `i < 0`.
 *
 * @param {number} count Number of elements to skip from the end of the source Observable.
 * @returns {Observable<T>} An Observable that skips the last count values
 * emitted by the source Observable.
 * @method skipLast
 * @owner Observable
 */
function skipLast(count) {
    return function (source) { return source.lift(new SkipLastOperator(count)); };
}
exports.skipLast = skipLast;
var SkipLastOperator = (function () {
    function SkipLastOperator(_skipCount) {
        this._skipCount = _skipCount;
        if (this._skipCount < 0) {
            throw new ArgumentOutOfRangeError_1.ArgumentOutOfRangeError;
        }
    }
    SkipLastOperator.prototype.call = function (subscriber, source) {
        if (this._skipCount === 0) {
            // If we don't want to skip any values then just subscribe
            // to Subscriber without any further logic.
            return source.subscribe(new Subscriber_1.Subscriber(subscriber));
        }
        else {
            return source.subscribe(new SkipLastSubscriber(subscriber, this._skipCount));
        }
    };
    return SkipLastOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SkipLastSubscriber = (function (_super) {
    __extends(SkipLastSubscriber, _super);
    function SkipLastSubscriber(destination, _skipCount) {
        _super.call(this, destination);
        this._skipCount = _skipCount;
        this._count = 0;
        this._ring = new Array(_skipCount);
    }
    SkipLastSubscriber.prototype._next = function (value) {
        var skipCount = this._skipCount;
        var count = this._count++;
        if (count < skipCount) {
            this._ring[count] = value;
        }
        else {
            var currentIndex = count % skipCount;
            var ring = this._ring;
            var oldValue = ring[currentIndex];
            ring[currentIndex] = value;
            this.destination.next(oldValue);
        }
    };
    return SkipLastSubscriber;
}(Subscriber_1.Subscriber));
//# sourceMappingURL=skipLast.js.map