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

To use the pairs function from the RxJS library, you first need to import it from the library like this:

index.tsx
import { pairs } from 'rxjs';
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The pairs function creates an Observable that emits an array of key-value pairs from the given object whenever a new property is added to the object. Here's an example of how you can use the pairs function:

index.tsx
const obj = { x: 1, y: 2 };
const obj$ = pairs(obj);

obj$.subscribe(pair => console.log(pair));
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In this example, we create an Observable obj$ using pairs function and pass our object obj to it. We then subscribe to the obj$ Observable and log the emitted key-value pairs to the console.

If we add a new property to the object like this:

index.tsx
obj.z = 3;
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the following output will be logged to the console:

index.tsx
["x", 1]
["y", 2]
["z", 3]
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This shows that the pairs function emits an array of key-value pairs whenever a new property is added to the object.