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Batching is a React feature that aggregates all state updates into a single update, resulting in a single re-render and thereby bettering the app's speed. Batching was only done for event handlers in early versions of React.

React has an interesting feature called batch updating, which mixes state updates. The fundamental notion is that all setState calls made within a React event handler or synchronous lifecycle method will be batched into a single update. There will only be one re-render at the conclusion of the process.

This will cause two or one rerenders depending on whether your code runs as part of an event handler or inside a regular function, and whether React batches the setState calls or not. We only batched updates during React event handlers till React 18.

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