RxJS - Multicasting Operator share

It is an alias for multicast() operator with the only difference is that you don't have to called connect () method manually to start the subscription.

Syntax

share()

Example

import { interval} from 'rxjs';
import { take, share} from 'rxjs/operators';

let observer = interval(1000).pipe(take(3), share());
const subscribe_one = observer.subscribe(
   x => console.log("Value from Sub1 = "+x)
);
const subscribe_two = observer.subscribe(
   x => console.log("Value from Sub2 = "+x)
);
setTimeout(() => {
   const subscribe_three = observer.subscribe(
      x => console.log("Value from Sub3 = "+x)
   );
}, 2000);

Output