Aggregators

• Opposite of splitters

• Combines multiple actions back down to one

• Useful when flow needs to wait for actions to complete before next step

// Effect aggregators
@Effect()
aggregator = this.actions$.pipe(
 ofType<LoadUserById>(UserActionTypes.LoadUserById),
 flatMap(a =>
   zip(
     this.actions$.pipe(
       ofType<LoadUserByIdSuccess>(UserActionTypes.LoadUserByIdSuccess),
       first(t => t.payload.id === a.payload.id)
     ),
     this.actions$.pipe(
       ofType<Logged>(LogActionTypes.Logged),
       first(t => t.payload.id === a.payload.id)
     )
   )
 ),
 map(pair => new LoadAdminUserSuccess())
);