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If `startBufferEvery` is not provided or is\n * `null`, then new buffers are started immediately at the start of the source\n * and when each buffer closes and is emitted.\n *\n * @example <caption>Emit the last two click events as an array</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var buffered = clicks.bufferCount(2);\n * buffered.subscribe(x => console.log(x));\n *\n * @example <caption>On every click, emit the last two click events as an array</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var buffered = clicks.bufferCount(2, 1);\n * buffered.subscribe(x => console.log(x));\n *\n * @see {@link buffer}\n * @see {@link bufferTime}\n * @see {@link bufferToggle}\n * @see {@link bufferWhen}\n * @see {@link pairwise}\n * @see {@link windowCount}\n *\n * @param {number} bufferSize The maximum size of the buffer emitted.\n * @param {number} [startBufferEvery] Interval at which to start a new buffer.\n * For example if `startBufferEvery` is `2`, then a new buffer will be started\n * on every other value from the source. A new buffer is started at the\n * beginning of the source by default.\n * @return {Observable<T[]>} An Observable of arrays of buffered values.\n * @method bufferCount\n * @owner Observable\n */\nexport function bufferCount<T>(bufferSize: number, startBufferEvery: number = null): OperatorFunction<T, T[]> {\n return function bufferCountOperatorFunction(source: Observable<T>) {\n return source.lift(new BufferCountOperator<T>(bufferSize, startBufferEvery));\n };\n}\n\nclass BufferCountOperator<T> implements Operator<T, T[]> {\n private subscriberClass: any;\n\n constructor(private bufferSize: number, private startBufferEvery: number) {\n if (!startBufferEvery || bufferSize === startBufferEvery) {\n this.subscriberClass = BufferCountSubscriber;\n } else {\n this.subscriberClass = BufferSkipCountSubscriber;\n }\n }\n\n call(subscriber: Subscriber<T[]>, source: any): TeardownLogic {\n return source.subscribe(new this.subscriberClass(subscriber, this.bufferSize, this.startBufferEvery));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass BufferCountSubscriber<T> extends Subscriber<T> {\n private buffer: T[] = [];\n\n constructor(destination: Subscriber<T[]>, private bufferSize: number) {\n super(destination);\n }\n\n protected _next(value: T): void {\n const buffer = this.buffer;\n\n buffer.push(value);\n\n if (buffer.length == this.bufferSize) {\n this.destination.next(buffer);\n this.buffer = [];\n }\n }\n\n protected _complete(): void {\n const buffer = this.buffer;\n if (buffer.length > 0) {\n this.destination.next(buffer);\n }\n super._complete();\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass BufferSkipCountSubscriber<T> extends Subscriber<T> {\n private buffers: Array<T[]> = [];\n private count: number = 0;\n\n constructor(destination: Subscriber<T[]>, private bufferSize: number, private startBufferEvery: number) {\n super(destination);\n }\n\n protected _next(value: T): void {\n const { bufferSize, startBufferEvery, buffers, count } = this;\n\n this.count++;\n if (count % startBufferEvery === 0) {\n buffers.push([]);\n }\n\n for (let i = buffers.length; i--; ) {\n const buffer = buffers[i];\n buffer.push(value);\n if (buffer.length === bufferSize) {\n buffers.splice(i, 1);\n this.destination.next(buffer);\n }\n }\n }\n\n protected _complete(): void {\n const { buffers, destination } = this;\n\n while (buffers.length > 0) {\n let buffer = buffers.shift();\n if (buffer.length > 0) {\n destination.next(buffer);\n }\n }\n super._complete();\n }\n\n}\n"]}
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