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

The mergewith function from the rxjs library in JavaScript is used to combine multiple sources of data into a single observable. This function takes an object as a parameter that defines the sources of the data, and returns an observable.

Here's an example of how to use mergewith:

index.tsx
import { mergeWith } from 'rxjs';
import { ajax } from 'rxjs/ajax';
import { of } from 'rxjs';

const source1 = ajax('/api/data1');
const source2 = ajax('/api/data2');
const source3 = of({ prop1: 'value1', prop2: 'value2' });

const merged$ = mergeWith({ source1, source2, source3 });

merged$.subscribe(data => {
  console.log(data);
});
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In this example, we import the mergeWith function from the rxjs library, as well as the ajax and of functions. We then define three data sources, source1, source2, and source3, using the ajax and of functions.

We then pass these sources as an object to the mergeWith function, which returns an observable, merged$. We subscribe to merged$ and log the combined data to the console.

This is just a basic example, but mergewith can be used to combine any number of data sources into a single observable, making it a powerful tool for working with data in JavaScript.