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

To use the of function from the rxjs library in JavaScript, first, install the library using your package manager like NPM or yarn:

index.tsx
npm install rxjs
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Then, import the of function from the library in your code using the following statement:

index.tsx
import { of } from 'rxjs';
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Finally, use the of function to create an observable that emits a sequence of values. For example, consider the following code that creates an observable that emits three values:

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

const observable = of(1, 2, 3);
observable.subscribe({
  next: value => console.log(value),
  complete: () => console.log('Complete')
})
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In this example, we create an observable observable using the of function that emits three values: 1, 2, and 3. We then subscribe to the observable and provide an object that defines two methods: next that is called whenever a value is emitted and complete that is called when the observable completes emitting values.

The of function can also be used to create an observable that emits an error by passing an error object as an argument. For example, the following code creates an observable that emits an error:

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

const observable = of(new Error('Something went wrong'));
observable.subscribe({
  error: error => console.error(error)
})
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In this example, we create an observable observable using the of function that emits an error object. We then subscribe to the observable and provide an object that defines an error method that is called when the error is emitted.