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React v18.0 has broken ground by introducing a long-awaited feature: Concurrency! Unfortunately, despite a deluge of resources explaining how to use it, explanations of how it works are sparse. As it is a low-level feature, it’s not critical to understand React’s idea of concurrency, but it doesn’t hurt! This post does not attempt to exhaustively document React’s Concurrent API and best practices.
JavaScript runs in a single-threaded environment with an event loop, an architecture that is very easy to reason about. It’s a continuous loop executing incoming work. Said work can schedule more of it for the future. while (hasWorkToDo) { /* Run timers, I/O callbacks, check for incoming connections, and so on... */ doWork(); } Synchronous work runs immediately; asynchronous work runs when there i
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