Basic createReducer Usage

Show how to convert a traditional switch-case reducer to use createReducer for a simple counter application.

import { createAction, createReducer } from '@reduxjs/toolkit';

// Action Types
const increment = createAction('increment');
const decrement = createAction('decrement');
const reset = createAction('reset');

// Initial State
const initialState = { count: 0 };

// Reducer using createReducer
const counterReducer = createReducer(initialState, (builder) => {
  builder
    .addCase(increment, (state, action) => {
      // Increments count
      state.count += 1;
    })
    .addCase(decrement, (state, action) => {
      // Decrements count
      state.count -= 1;
    })
    .addCase(reset, (state, action) => {
      // Resets count to zero
      state.count = 0;
    });
});

export default counterReducer;

This code creates a counter reducer with increment, decrement, and reset actions using Redux Toolkit's createReducer. The createAction function is used to define action types, and createReducer is used in place of a traditional switch-case reducer.