In the update stage of a component, React has to determine which child components to mount, update, and unmount. It’s important to understand how React’s reconciliation works to build performant apps as well as avoid confusing bugs.
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Hi! My name's Paul. I was an engineer at Facebook where I built React UI components as well as taught React (and other things). I believe React is the best way to build applications and I'd like to share the library with you.