and are both that allow you to manage the state of your components. is a simpler hook that allows you to manage a single piece of state, while is more powerful and allows you to manage more complex states that may have multiple values and require more sophisticated updates. useState useReducer React hooks useState useReducer To convert from to , you can follow these general steps: useState useReducer Define an initial state and an action type. Replace the hook with the hook. useState useReducer Create a reducer function that takes a state and an action and returns a new state. Update the component to use the new state and dispatch functions returned by the hook, which should have the reducer and initial state passed in. useReducer Here is a basic example of how to convert a component that uses to manage a single piece of state. useState Start with a Counter component: import React, { useState } from 'react';

const Counter = () => {
  const [count, setCount] = useState(0);

  const increment = () => {
    setCount(count + 1);
  };

  return (
    <>
      <p>Count: {count}</p>
      <button onClick={increment}>Increment</button>
    </>
  );
}

export default Counter; To convert this to use , we can follow the steps outlined above: useReducer Define an initial state and an action type: const initialState = { count: 0 };
const INCREMENT = 'increment'; Replace the hook with a hook: useState useReducer import React, { useReducer } from 'react';

const Counter = () => {
  const [state, dispatch] = useReducer(reducer, initialState);

  // ...
} Create a reducer function that takes a state and an action and returns a new state: const reducer = (state, action) => {
  switch (action.type) {
    case INCREMENT:
      return { count: state.count + 1 };
    default:
      throw new Error();
  }
} Update the component to use the new state and dispatch functions returned by the hook, which should have the reducer and initial state passed in: useReducer const Counter = () => {
  const [state, dispatch] = useReducer(reducer, initialState);

  const increment = () => {
    dispatch({ type: INCREMENT });
  };

  return (
    <>
      <p>Count: {state.count}</p>
      <button onClick={increment}>Increment</button>
    </>
  );
} In step 4, the dispatch function is used to send an action to the reducer function. The reducer function then returns a new state based on the action type. The component is also updated to use instead of the count variable previously returned by . state.count useState In this simple example, doesn't bring many benefits over . But in general, as your components grow in complexity, provides a more powerful and flexible way to manage state - especially when you have a more complex state that requires multiple values and more sophisticated updates. useReducer useState useReducer This article was originally posted . here Let me know what you think in the comments!

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Migrating from useState to useReducer in React Hooks

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Lyndsi Williams

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Migrating from useState to useReducer in React Hooks

Too Long; Didn't Read

Lyndsi Williams

About Author

TOPICS

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