how to use the timer function from the rxjs library in typescript

To use the timer function from the rxjs library in TypeScript, you first need to install the rxjs library, which you can do using npm. Run the following command in your terminal to do so:

index.ts
npm install rxjs
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Once you have installed the rxjs library, you can use the timer function to create an observable that emits a sequence of numbers at a specified interval. Here's an example of how to use the timer function in TypeScript:

index.ts
import { timer } from 'rxjs';

const source = timer(1000, 2000); // emits the first value after 1 second, then every 2 seconds

const subscription = source.subscribe(val => console.log(val));

// Later, you can unsubscribe from the observable to stop emissions
subscription.unsubscribe();
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In this example, we're creating an observable called source that will emit the first value after 1 second, and then emit subsequent values every 2 seconds. We're using the subscribe method to listen to the emissions and logging them to the console.

Finally, we're storing the subscription in a variable, which we can use later to unsubscribe from the observable and stop emissions.

Note: It's important to unsubscribe from observables to avoid memory leaks.