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

The partition function in the rxjs library is used to filter values of an observable into two separate observables based on a provided condition. Here's an example of how to use it in JavaScript:

index.tsx
// import the required operators and functions from rxjs
import { from } from 'rxjs';
import { partition } from 'rxjs/operators';

// create an observable to work with
const source = from([1, 2, 3, 4, 5]);

// partition the observable into even and odd numbers
const [evens$, odds$] = source.pipe(partition(num => num % 2 === 0));

// subscribe to the even numbers observable
evens$.subscribe(even => console.log(`even: ${even}`));

// subscribe to the odd numbers observable
odds$.subscribe(odd => console.log(`odd: ${odd}`));
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In this example, we created an observable source that emits a sequence of numbers. We then used the partition operator to split this observable into two separate observables - one with even numbers and one with odd numbers. Finally, we subscribed to each of these observables and logged their values to the console.

Note that the partition operator returns an array of two observables - the first observable contains the values that pass the provided condition (in this case, even numbers), and the second contains the values that do not pass the condition (odd numbers).