React useReducer Hook

Manage complex state logic and transitions cleanly with action dispatches.

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The useReducer hook is preferable to useState when you have complex state logic that involves multiple sub-values or when the next state depends on the previous one (Redux-style).

Key Takeaways: React useReducer Hook

Mastering React useReducer Hook helps you write clean and reliable React code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

React useReducer Hook Code Example

React

import React, { useReducer } from "react";

function counterReducer(state, action) {
  switch (action.type) {
    case "increment": return { count: state.count + 1 };
    case "decrement": return { count: state.count - 1 };
    default: return state;
  }
}

export default function Counter() {
  const [state, dispatch] = useReducer(counterReducer, { count: 0 });
  return (
    <div>
      <p>Count: {state.count}</p>
      <button onClick={() => dispatch({ type: "increment" })}>+</button>
    </div>
  );
}

Output

Interactive counter managed by reducer dispatch

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React useCallback Hook

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React useReducer Hook

💡 Key Takeaways: React useReducer Hook

React useReducer Hook Code Example

Key Takeaways: React useReducer Hook