| /** PURE_IMPORTS_START .._Subscriber,.._util_ArgumentOutOfRangeError PURE_IMPORTS_END */ |
| 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 __()); |
| }; |
| import { Subscriber } from '../Subscriber'; |
| import { ArgumentOutOfRangeError } from '../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 |
| */ |
| export function skipLast(count) { |
| return function (source) { return source.lift(new SkipLastOperator(count)); }; |
| } |
| var SkipLastOperator = /*@__PURE__*/ (/*@__PURE__*/ function () { |
| function SkipLastOperator(_skipCount) { |
| this._skipCount = _skipCount; |
| if (this._skipCount < 0) { |
| throw new 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(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 = /*@__PURE__*/ (/*@__PURE__*/ 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)); |
| //# sourceMappingURL=skipLast.js.map |