F - epic logic.ts

// Example
// Error handling and such omitted for simplicity

export const profileEpic = action => action.pipe(
  ofType(SEARCH_PROFILE),
  switchMap(term => getProfileByTerm(term).pipe(
    map(({ body }) => {
      let name = body.name;
      if (name && name !== 'Andrew') {
        name = name.toUpperCase();
      } else {
        name = name.split('n').join('');
      }

      new SearchProfileSuccessAction(name)),
    }
  ),
);

export function profileReducer(state = { name: '' }, action) {
  switch (action.type) {
    case SEARCH_PROFILE_SUCCESS:
      return { ...state, name: action.payload };
    default:
      return state;
  }
}

Good - reducer logic.ts

// Better Example
// Error handling and such omitted for simplicity

export const profileEpic = action => action.pipe(
  ofType(SEARCH_PROFILE),
  switchMap(term => getProfileByTerm(term).pipe(
    map(({ body }) => new SearchProfileSuccessAction(body)),
  ),
);

export function profileReducer(state = { name: '' }, action) {
  switch (action.type) {
    case SEARCH_PROFILE_SUCCESS:
      let name = action.payload.name;
      if (name && name !== 'Andrew') {
        name = name.toUpperCase();
      } else {
        name = name.split('n').join('');
      }
      return { ...state, name };
    default:
      return state;
  }
}