This article explains the mechanics behind React re‑rendering, how state and props changes trigger renders, common pitfalls that cause multiple renders in class and function components, and practical strategies—including batching, state merging, useReducer, and refs—to minimize unnecessary updates.
This article explains how React (pre‑16.8) batches multiple setState calls using batchedUpdates, demonstrates the internal mechanism with source‑level debugging, shows code examples including setTimeout edge cases, and summarizes the key steps that enable the framework’s performance optimization.
This article explains the fundamentals and deep internals of React’s setState method, covering basic usage, asynchronous behavior, state‑update pitfalls, functional updates, and the underlying mechanisms such as enqueueSetState, enqueueUpdate, batchingStrategy, and transaction processing, illustrated with code snippets and diagrams.
This article explains when React's setState behaves synchronously or asynchronously, how batch updates are merged into a single render, and the proper way to retrieve the updated state using the callback parameter, illustrated with clear diagrams and code examples.
