How React Works (Part 3)? How React Finds What Actually Changed

How React Finds What Actually Changed Series: How React Works Under the Hood Part 1: Motivation Behind React Fiber: Time Slicing & Suspense Part 2: Why React Had to Build Its Own Execution Engine Prerequisites: Read Parts 1 and 2 first. Where We Left Off In Part 2 we understood the engine — Fiber gives React a custom call stack it controls, and the Scheduler decides what to run and when. Now the question is: what does React actually do with that engine? Every time state changes, React has a