Câu hỏi phỏng vấn Reactjs
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When to use useSta...

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When deciding between useState and useReducer for state management in React, the choice largely depends on the complexity of the state logic and the structure of the state you are managing.

useState Hook

useState is a basic hook that is suitable for managing simple state transformations. It is ideal when you have a single state variable that does not depend on complex logic or multiple sub-values. This hook is straightforward and easy to use, making it a good choice for beginners or for simple state management scenarios. It allows you to declare a state variable and a function to update it in one line of code, and you can use multiple useState hooks to manage different pieces of state independently within your component[1][4][6].

useReducer Hook

useReducer, on the other hand, is more powerful and flexible, and it is better suited for handling complex state logic that involves multiple sub-values or when the next state depends on the previous one. It allows you to handle multiple actions within a single reducer function, which can make the logic more organized and easier to understand, especially when the state logic becomes complex[1][2][3][5][7].

Considerations for useState

  • Use useState when managing JavaScript primitives like strings, numbers, or booleans[5].
  • It is suitable for simple business logic where state transitions are straightforward[5].
  • When different pieces of state do not change in any correlated way and can be managed by multiple useState hooks[5].

Considerations for useReducer

  • Use useReducer when managing JavaScript objects or arrays as state[5].
  • It is more suitable for complicated business logic that is better handled b...
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