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authorPinapelz <yukais@pinapelz.com>2025-06-29 11:49:28 -0700
committerPinapelz <yukais@pinapelz.com>2025-06-29 11:49:28 -0700
commitd55b767039605256c736166a942a9138e3eacfd7 (patch)
tree947063b634c50d438a794325f13275e134aa5993 /node_modules/rxjs/src/internal/operators/bufferCount.ts
parent864ce67d89c77d8ef9c3361f80d619853abcf91c (diff)
remove dev node_modules (oops)
Diffstat (limited to 'node_modules/rxjs/src/internal/operators/bufferCount.ts')
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diff --git a/node_modules/rxjs/src/internal/operators/bufferCount.ts b/node_modules/rxjs/src/internal/operators/bufferCount.ts
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-import { OperatorFunction } from '../types';
-import { operate } from '../util/lift';
-import { createOperatorSubscriber } from './OperatorSubscriber';
-import { arrRemove } from '../util/arrRemove';
-
-/**
- * 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>
- *
- * ![](bufferCount.png)
- *
- * 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.
- *
- * ## Examples
- *
- * Emit the last two click events as an array
- *
- * ```ts
- * import { fromEvent, bufferCount } from 'rxjs';
- *
- * const clicks = fromEvent(document, 'click');
- * const buffered = clicks.pipe(bufferCount(2));
- * buffered.subscribe(x => console.log(x));
- * ```
- *
- * On every click, emit the last two click events as an array
- *
- * ```ts
- * import { fromEvent, bufferCount } from 'rxjs';
- *
- * const clicks = fromEvent(document, 'click');
- * const buffered = clicks.pipe(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 bufferSize The maximum size of the buffer emitted.
- * @param 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 A function that returns an Observable of arrays of buffered values.
- */
-export function bufferCount<T>(bufferSize: number, startBufferEvery: number | null = null): OperatorFunction<T, T[]> {
- // If no `startBufferEvery` value was supplied, then we're
- // opening and closing on the bufferSize itself.
- startBufferEvery = startBufferEvery ?? bufferSize;
-
- return operate((source, subscriber) => {
- let buffers: T[][] = [];
- let count = 0;
-
- source.subscribe(
- createOperatorSubscriber(
- subscriber,
- (value) => {
- let toEmit: T[][] | null = null;
-
- // Check to see if we need to start a buffer.
- // This will start one at the first value, and then
- // a new one every N after that.
- if (count++ % startBufferEvery! === 0) {
- buffers.push([]);
- }
-
- // Push our value into our active buffers.
- for (const buffer of buffers) {
- buffer.push(value);
- // Check to see if we're over the bufferSize
- // if we are, record it so we can emit it later.
- // If we emitted it now and removed it, it would
- // mutate the `buffers` array while we're looping
- // over it.
- if (bufferSize <= buffer.length) {
- toEmit = toEmit ?? [];
- toEmit.push(buffer);
- }
- }
-
- if (toEmit) {
- // We have found some buffers that are over the
- // `bufferSize`. Emit them, and remove them from our
- // buffers list.
- for (const buffer of toEmit) {
- arrRemove(buffers, buffer);
- subscriber.next(buffer);
- }
- }
- },
- () => {
- // When the source completes, emit all of our
- // active buffers.
- for (const buffer of buffers) {
- subscriber.next(buffer);
- }
- subscriber.complete();
- },
- // Pass all errors through to consumer.
- undefined,
- () => {
- // Clean up our memory when we finalize
- buffers = null!;
- }
- )
- );
- });
-}
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