ngrx_user.selectors.ts

export const getUsersEntities = createSelector(getUsersState, fromUsers.getUsersEntities);  
export const getAllUsers = createSelector(getUsersEntities, (entities) => Object.keys(entities).map(id => entities[id]));  
export const getUsersLoaded = createSelector(getUsersState, fromUsers.getUsersLoaded);  
  
export const getAdminUsers = createSelector(  
  getAllUsers,  
 (users: Users.List): Users.List => users.filter(user => user.isAdmin)
);