Question

 How to set initial state in Redux?

Answer 1

You need to pass initial state as second argument to createStore

const rootReducer = combineReducers({
  todos: todos,
  visibilityFilter: visibilityFilter
});

const initialState = {
  todos: [{id:123, name:'sudheer', completed: false}]
};

const store = createStore(
  rootReducer,
  initialState
);