Funky ngrx reducer notes

thing.reducer.ts

import { IUser } from './../state/app.state';
import { UserActionTypes, EditUserAction } from '../actions/user.actions';

// All reducers get called with all actions.
// So how the fuck does it know where in AppState state comes from?
// Theory: app.reducer -- reducers.user --> userReducer
// Pseudocode:
//  for action in actions
//    let function;
//    unrolled example:
//      function = reducers.user;  state.user = function(state.user, action);
//      function = reducers.x;  state.x = function(state.x, action);
//
//    state.x might not exist which means it gets called with the default arg somehow
//    and thereafter, it does exist. So things can get added to the store without typing...
//
// Direct store select and log synchronously:
//    import 'rxjs/add/operator/take';
//    ...
//    this.store.take(1).subscribe(next => console.log(next));


export function funkyReducer(state = '', action: {type, payload?}): string {

  console.log('funkyReducer ' + action.type);
  console.log(state);

  switch (action.type) {

    default: {
      return state;
    }
  }
}