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

To use the pairs() function from the rxjs library in TypeScript, you must first import it from the library. You can do this using the following code:

index.ts
import { pairs } from 'rxjs';

const obj = { name: 'John', age: 30 };
const source = pairs(obj);

source.subscribe({
  next: ([key, value]) => console.log(`${key}: ${value}`),
  error: err => console.log(err),
  complete: () => console.log('done')
});
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In this example, we create an object obj with two properties - name and age. We then use the pairs() function to create an observable source that emits an array of [key, value] pairs for each property of the object.

We then subscribe to source and log each [key, value] pair to the console using destructuring assignment in the next callback function.

Note that the pairs() function is only available in RxJS version 6 or later.