Fiber is the name given to the new reconciliation algorithm introduced in React 16.
It was a major rewrite of React's core algorithm, and it was designed to improve the performance of the library, especially when dealing with large lists of elements or complex user interactions.
The main concept behind Fiber is the ability to split the work of reconciliation into smaller chunks, which can be spread out over multiple frames. This allows React to better utilize the browser's main thread, and also to more efficiently manage and prioritize the different updates that need to be made to the UI.
Fiber also introduced new concepts such as "priority" and "expiration times" that allow React to control the order and timing of updates, so that critical updates can be processed first and less critical updates can be delayed or batched together to improve performance.
Fiber also introduced the concept of "Suspense" which allows developers to write code that can "suspend" the rendering of a component until certain data is available, this improves the user experience in case of slow network, by showing loading spinner or fallback content.
Overall, the Fiber algorithm provides a more efficient and flexible way for React to update the UI and should lead to better performance and a more responsive user experience.
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