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

To use the zip function from the rxjs library in TypeScript, you will first need to import it from the library. Then you can use the pipe function to combine multiple observables into one.

index.ts
import { zip } from 'rxjs';
import { Observable } from 'rxjs/Observable';
import { pipe } from 'rxjs/operators';

const observable1 = new Observable(observer => {
  observer.next('A');
  setTimeout(() => observer.next('B'), 1000);
});

const observable2 = new Observable(observer => {
  observer.next('1');
  setTimeout(() => observer.next('2'), 500);
});

const zipped = zip(observable1, observable2);

const subscription = zipped.pipe(
  // add any operators you need here, such as map, filter, etc.
).subscribe({
  next: ([valueFromObservable1, valueFromObservable2]) => {
    console.log(valueFromObservable1, valueFromObservable2);
  }
});
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In this example, we created two observables (observable1 and observable2) that emit values over time. We then used the zip function to combine them into a single observable (zipped). Finally, we subscribed to the zipped observable and used the next callback to handle the emitted values. Since zip combines multiple observables into an array of their emitted values, the next callback returns an array with one element for each observable that was zipped (in this case, two). We use array destructuring to extract the values from the array and log them to the console.