Learning Observable By Building Observable

I’ve since rewritten the piece and moved it to my personal blog here:https://benlesh.com/posts/learning-observable-by-building-observable/ Frequently via social media, or in person at events, I’m asked questions about “hot” vs “cold” observables, or whether or not an observable is “multicast” or “unicast”. People seem to be really mystified by what they feel to be the dark inner-workings of `Rx.Ob