This example uses a creation operator to log when a user clicks a button.
RxJS creation operators are functions that create new Observables. These operators are useful for generating data on-demand or for creating Observables from things. One such operator is fromEvent, which creates an Observable that emits events from a DOM element. This is very useful when developing web applications around user input.
The fromEvent operator takes two arguments: the DOM element to bind to, and the name of the event to listen for. For example, you might use fromEvent to create an Observable that emits a stream of mousemove events from the document object, like this:
import { fromEvent } from 'rxjs';
const mouseMoveStream = fromEvent(document, 'click');You can then subscribe to the resulting Observable and perform any desired operations on the events emitted by the stream.