React Reconciler has seen huge improvements from how it used to work in React v15, all to pave the way for a bit of magic called "Concurrent Features."

In this talk we'll take an example app working in React v15, figure out how React Reconciler used to work and compare it to how it works now in React v18 (Fiber). We'll also see how all that led to Concurrent Features and how Computer Science ties it all together.

Saving the best for last, we'll opt-in to Concurrent mode, implement Concurrent Features and see how this enhances our example app.