Migrating Switch-Case Reducers to createSlice

Demonstrate the process of refactoring a traditional switch-case reducer into a more declarative reducer using `createSlice`.

// Traditional switch-case reducer
function counterReducer(state = { count: 0 }, action) {
  switch (action.type) {
    case 'increment':
      return { count: state.count + 1 };
    case 'decrement':
      return { count: state.count - 1 };
    default:
      return state;
  }
}

This is the traditional way of writing a reducer with switch-cases to handle different actions.

// Import createSlice from Redux Toolkit
import { createSlice } from '@reduxjs/toolkit';

// Refactoring the traditional reducer to use createSlice
const counterSlice = createSlice({
  name: 'counter',
  initialState: { count: 0 },
  reducers: {
    increment: state => {
      state.count += 1;
    },
    decrement: state => {
      state.count -= 1;
    }
  }
});

// Export the generated action creators and the reducer
export const { increment, decrement } = counterSlice.actions;
export default counterSlice.reducer;

The traditional reducer is refactored using createSlice from Redux Toolkit. It automatically generates action creators and handles the switch-case logic declaratively.