Learning Redux

Users reducer

Let's start with the users reducer.

1. Create a new file src/reducers/users.js and import the action type:

import { CREATE_USER } from '../actionTypes'

2. Now, we define the function—the default state should be an empty array:

export default function usersReducer (state = [], action) {

3. Since we are only handling one action here, we use an if statement instead of switch:

  const { type, ...user } = action
  
  if (type === CREATE_USER) {
    return [ ...state, user ]
  }

4. Don't forget to return the current state if the action isn't handled:

  return state
}