Why do I get “Reducer […] returned undefined during initialization” despite providing initialState to createStore()?

Question

I had set InitialState in my redux createStore method ,and I corresponding InitialState as second arguments

I got a error in browser:

Un         


        

Answer 1

Also, make sure that you are returning the default state last in your reducer. Sometimes you can forget to make sure this is the default for your switch statement (when refactoring and moving around code).

...
 default:
  return state