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Let's dive right in. We have created something called an Observable. An async construct, much like a promise that we can listen to once the data arrives.
import { from } from 'rxjs';
let stream$ = from([1,2,3])
stream$.subscribe( (value) => {
console.log('Value',value);
})
// 1,2,3
The corresponding way of doing this if dealing with promises would be to write
let promise = new Promise((resolve, reject) => {
setTimeout(()=> {
resolve( [1,2,3] )
})
})
promise.then((value) => {
console.log('Value',data)
})
Promises lack the ability to generate more than one value, ability to retry and it doesn't really play well with other async concepts.