How Can I Correctly Update React State Within setInterval Using Hooks?

Understanding State Maintenance with React State Hooks and setInterval

When utilizing React state hooks within an setInterval function, it's crucial to ensure that the closure within the callback accesses the most recent state value. If not, the state may not update correctly, leading to unexpected behavior.

In the example provided, the setInterval callback only accesses the initial state value for the time variable, which is 0. Even though the state is updated subsequently, the callback continues to use the original value.

The solution is to use the callback form of the useState hook, which allows you to read the current state within the callback. This ensures that you have the most up-to-date state value before making updates.

Bonus: Alternative Approaches

For a more thorough exploration of this topic, refer to Dan Abramov's blog post, which delves into the details of using setInterval with hooks and offers alternative solutions.

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