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<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { Subscriber } from '../Subscriber'; /** * Buffers the source Observable values until the size hits the maximum * `bufferSize` given. * * <span class="informal">Collects values from the past as an array, and emits * that array only when its size reaches `bufferSize`.</span> * * <img src="./img/bufferCount.png" width="100%"> * * Buffers a number of values from the source Observable by `bufferSize` then * emits the buffer and clears it, and starts a new buffer each * `startBufferEvery` values. If `startBufferEvery` is not provided or is * `null`, then new buffers are started immediately at the start of the source * and when each buffer closes and is emitted. * * @example <caption>Emit the last two click events as an array</caption> * var clicks = Rx.Observable.fromEvent(document, 'click'); * var buffered = clicks.bufferCount(2); * buffered.subscribe(x => console.log(x)); * * @example <caption>On every click, emit the last two click events as an array</caption> * var clicks = Rx.Observable.fromEvent(document, 'click'); * var buffered = clicks.bufferCount(2, 1); * buffered.subscribe(x => console.log(x)); * * @see {@link buffer} * @see {@link bufferTime} * @see {@link bufferToggle} * @see {@link bufferWhen} * @see {@link pairwise} * @see {@link windowCount} * * @param {number} bufferSize The maximum size of the buffer emitted. * @param {number} [startBufferEvery] Interval at which to start a new buffer. * For example if `startBufferEvery` is `2`, then a new buffer will be started * on every other value from the source. A new buffer is started at the * beginning of the source by default. * @return {Observable<T[]>} An Observable of arrays of buffered values. * @method bufferCount * @owner Observable */ export function bufferCount(bufferSize, startBufferEvery) { if (startBufferEvery === void 0) { startBufferEvery = null; } return this.lift(new BufferCountOperator(bufferSize, startBufferEvery)); } var BufferCountOperator = (function () { function BufferCountOperator(bufferSize, startBufferEvery) { this.bufferSize = bufferSize; this.startBufferEvery = startBufferEvery; } BufferCountOperator.prototype.call = function (subscriber, source) { return source._subscribe(new BufferCountSubscriber(subscriber, this.bufferSize, this.startBufferEvery)); }; return BufferCountOperator; }()); /** * We need this JSDoc comment for affecting ESDoc. * @ignore * @extends {Ignored} */ var BufferCountSubscriber = (function (_super) { __extends(BufferCountSubscriber, _super); function BufferCountSubscriber(destination, bufferSize, startBufferEvery) { _super.call(this, destination); this.bufferSize = bufferSize; this.startBufferEvery = startBufferEvery; this.buffers = []; this.count = 0; } BufferCountSubscriber.prototype._next = function (value) { var count = this.count++; var _a = this, destination = _a.destination, bufferSize = _a.bufferSize, startBufferEvery = _a.startBufferEvery, buffers = _a.buffers; var startOn = (startBufferEvery == null) ? bufferSize : startBufferEvery; if (count % startOn === 0) { buffers.push([]); } for (var i = buffers.length; i--;) { var buffer = buffers[i]; buffer.push(value); if (buffer.length === bufferSize) { buffers.splice(i, 1); destination.next(buffer); } } }; BufferCountSubscriber.prototype._complete = function () { var destination = this.destination; var buffers = this.buffers; while (buffers.length > 0) { var buffer = buffers.shift(); if (buffer.length > 0) { destination.next(buffer); } } _super.prototype._complete.call(this); }; return BufferCountSubscriber; }(Subscriber)); //# sourceMappingURL=bufferCount.js.map</code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>