Deciders

• Decides if this effect should process this action (ofType)

• Can map an action to a different action

Content Deciders

• Inspect the payload to decide how to process action

• Can inspect payloads, environmental variables, or store values.

• Can map an action to a different action based on payload

@Effect()
 save = this.actions$.pipe(
   ofType<SaveUser>(UserActionTypes.SaveUser),
   map(action => {
     if (action.payload.user.id > 0) {
       return new UpdateUser(action.payload);
     } else {
       return new InsertUser(action.payload);
     }
   })
 );

// Effect store based decider
 @Effect()
 save = this.actions$.pipe(
   ofType<LoadUserById>(UserActionTypes.SaveUser),
   withLatestFrom(this.store.pipe(select(getSelectedUserId))),
     map(([action, userId]) => {
       if (userId > 0) {
         return new UpdateUser(action.payload);
       } else {         
         return new InsertUser(action.payload);
       }
     }));