Build a Reactive Store

Observer pattern

Challenge 1 of Decouple EventsIntermediate~55 minFree

Build the machinery behind signals, RxJS, and Vue/MobX reactivity from the Observer pattern up: a Subject that notifies observers, subscriptions you can cancel, an observable value that only fires on real change, derived computed values, and effects that re-run when their state changes.

5 steps

1. 1The Subject
2. 2Unsubscribing
3. 3The Observable Value
4. 4Computed Values
5. 5Effects