ForkGeneric: it is a simple package which helps you to fork two value.

How to Import on your Project

To import the ForkGeneric in your project ,it is not available yet in pub.dev just move to your pubspec.yaml file and put this code :

  dependencies:
    fork_generic:
      git:
        url: https://github.com/MarioCarlosChita/Fork-Generic-Package.git
        ref: main # branch name

Methods Available

isRight()

It´s verify it the return is on the right side;

    ForkGeneric<String,bool> checkBalance(String userId){
       return  userId.contains("@key") ? RightForkGeneric(true): LeftForkGeneric("Has the key")
      }     
     bool  verifyDirection =   checkBalance("32322ASASauser@Key").isRight();
     print(verifyDirection) => true;

isLeft()

It´s verify it the return is on the left side;

    ForkGeneric<String,bool> checkBalance(String userId){
       return  userId.contains("@key") ? RightForkGeneric(true): LeftForkGeneric("Has the key")
    }     
    bool  verifyDirection =   checkBalance("32322ASASauser@Key").isLeft();
    print(verifyDirection) => false;

fold()

It returns the both side right and left, by this you can verify verify the values on the side.

    ForkGeneric<String,bool> checkBalance(String userId){
       return  userId.contains("@key") ? RightForkGeneric(true): LeftForkGeneric("Has the key")
    }  

  void main(){
      checkBalance("32322ASASauser@Key".fold(
        (left){
           print("left data");
           print(left);
        } ,
        (right){ 
           print("right data");
           print(left);
        }
      );    
  }     

Example

    // Simple example with random value  
    const int MaxNumber = 6; 
    ForkGeneric<String,int>  guessIt(){
       Random  random = math.Random(); 
       int value  =random.nextIntOfDigits(MaxNumber);
       if (value % 2  == 0)
         return RightForkGeneric(value);
       else
         return LeftForkGeneric("Not an Even number");      
    }  
  
  void main(){
       guessIt().fold(
          (left){
             print(left)
          },
          (right){
            print(right);
          }
       )    
  } 

    // Simple Example width http client
    // Http Package used in this is example and imported as http  
    const String Api_Url = "https://jsonplaceholder.typicode.com";

    Future<ForkGeneric<Exception,Response>> fetchPosts() async{
      final request  = await http.get(Uri.parse("${Api_Url}/posts"));
      if (request.statusCode == HttpStatusCode.ok){
           return RightForkGeneric(request);   
      } 
      return  LeftForkGeneric(SocketExcption()); 
    }


    void main(){
       fetchPosts().fold(
          (left){
             print(left)
          },
          (right){
            print(right);
          }
       )   
    }

Additional information

So as I said this is a simple package which makes fork of two values it is still in developing. feel free to contribute , sugest.Thanks