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

The merge function from the rxjs library allows you to combine multiple Observables into one. Here is an example:

index.tsx
import { of, merge } from 'rxjs';

const source1$ = of('Hello');
const source2$ = of('World!');

const merged$ = merge(source1$, source2$);

merged$.subscribe(
  value => console.log(value),
  error => console.error(error),
  () => console.log('Completed!')
);

// Output: 
// Hello
// World!
// Completed!
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In this example, we import the of and merge functions from the rxjs library. We create two Observables, source1$ and source2$, using the of function. Then, we use the merge function to combine both Observables into merged$. Finally, we subscribe to merged$ to log the emitted values (Hello and World!) and the completion message (Completed!).

Note that the merge function emits values as soon as they are emitted by any of the combined Observables. If you want to wait until all Observables have emitted at least one value before emitting values from the merged Observable, you can use the forkJoin function instead.