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

To use the sampleTime function from the rxjs library in JavaScript, you first need to import it. Here's the code to do that:

index.tsx
import { sampleTime } from 'rxjs/operators';
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Once you have imported it, you can use it to create an observable that samples the source observable at a specified interval. Here's what the basic usage looks like:

index.tsx
import { interval } from 'rxjs';
import { sampleTime } from 'rxjs/operators';

const source = interval(1000); // emits a value every second
const example = source.pipe(sampleTime(2000)); // samples the source every 2 seconds

example.subscribe(value => console.log(value)); // logs the sampled values
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In this example, the interval function creates an observable that emits a value every second. The sampleTime function is then used to create a new observable that samples the source observable every 2 seconds. Finally, the subscribe method is used to log the sampled values to the console.

Note that sampleTime returns a new observable rather than modifying the source observable. This means that you can chain it with other operators to create more complex observable pipelines.