how to use the buffercount function from the rxjs library in javascript

The bufferCount operator in RXJS allows you to collect items emitted by an Observable into a buffer array, and when said array reaches a specified size it is emitted by the operator.

Here's an example of using bufferCount in JavaScript:

index.tsx
const { interval } = rxjs;
const { bufferCount } = rxjs.operators;

const source = interval(1000); //emit every 1000ms
const buffer = 4; //emit buffer of 4 values

const bufferedSource = source.pipe(bufferCount(buffer));

const subscription = bufferedSource.subscribe(console.log);
282 chars
10 lines

In the code block above, we created an observable source that emits a value every second. We then specified that we want to buffer four values at a time with buffer = 4. Finally, we created a new observable bufferedSource by piping the original source observable through the bufferCount operator.

In the end, the operator emits the buffered values (an array of four) and then start buffering again.

The output of this code will be an array of four values emitted every 4 seconds.