Use Redux for managing state in your React applications. Redux is a predictable state container for JavaScript applications. It provides a centralized store for managing the state of your application, making it easier to reason about and debug. Redux is especially useful for large-scale applications with complex state management requirements.

Redux works by maintaining a single source of truth for your application state. This state is represented as a plain JavaScript object, which can be modified only by dispatching actions. Actions are plain JavaScript objects that describe changes to the state. Reducers are pure functions that take the current state and an action as input, and return a new state object that reflects the changes described by the action. The store is responsible for managing the state and dispatching actions to the reducers.

Using Redux in your React applications can help you avoid common pitfalls such as prop drilling, where props are passed down through multiple levels of components. With Redux, you can access the state directly from any component, without having to pass it down as props. This can make your code more modular and easier to maintain. Redux also provides powerful debugging tools, such as the Redux DevTools extension, which can help you track changes to your application state over time.

// Define an action
const increment = () => {
  return {
    type: 'INCREMENT'
  }
}

// Define a reducer
const counterReducer = (state = { count: 0 }, action) => {
  switch (action.type) {
    case 'INCREMENT':
      return { count: state.count + 1 }
    default:
      return state
  }
}

// Create a store
const store = createStore(counterReducer)

// Dispatch an action
store.dispatch(increment())