When to use useReducer hook?

You might consider using the useReducer hook in the following situations:

1. When you have complex state logic that involves multiple sub-values or the need to perform calculations based on the previous state.
2. When you want to optimize performance by minimizing the number of re-renders. useReducer allows you to batch updates to the state and avoid unnecessary re-renders.
3. When you want to share state logic between multiple components. You can extract the reducer function and use it with useReducer in multiple components, rather than duplicating the logic in multiple useState hooks.

It's worth noting that useReducer is not always the best choice for every situation. It can be more verbose than useState, and it may be overkill for simple state updates. In those cases, useState it might be a better fit.

Ultimately, the decision of whether to use useReducer or useState will depend on the specific needs of your application. Both hooks can be helpful tools for managing state in React, and you should choose the one that best fits your use case.