Polymorphism

Polymorphic Array

void main() {
  
  // Polymorphism 

  Employee e1 = Developer(10);
  
  Employee e2 = Developer(20);
  

  Employee e3 = Manager(30);
  
  Employee e4 = Manager(40); 
  
  
  
  List<Employee> organization = [e1,e2,e3,e4]; 
  
  
  
  for(var employee in organization) {
    
    
     print(employee.salary(20));
      
    }
  
  

}

class Employee {

  int dayworked;

  int salary(int perDaywage) {
    return (this.dayworked * perDaywage);
  }
  
  Employee(this.dayworked);
}




// Developer Class
class Developer extends Employee {
  
  
  @override 
  int salary (int perDaywage){
    
    return (this.dayworked*perDaywage+80);
  }
  
  
  Developer(int dayworked):super(dayworked);
  

  
}





// Manager Class

class Manager extends Employee {
  
  
  @override 
  int salary (int perDaywage){
    
    return (this.dayworked*perDaywage+30);
  }
  
   Manager(int dayworked):super(dayworked);
}

Diagram

Reasoning behind the name

Polymorphic arguments

void main() {
  
  // Polymorphism => Polymorphic argument 
  
  int calsalary(Employee employee){
     
     return employee.salary(20);
    
  }
     
   print(calsalary(Manager(10)));
  

}

class Employee {

  int dayworked;

  int salary(int perDaywage) {
    return (this.dayworked * perDaywage);
  }
  
  Employee(this.dayworked);
}




// Developer Class
class Developer extends Employee {
  
  
  @override 
  int salary (int perDaywage){
    
    return (this.dayworked*perDaywage+80);
  }
  
  
  Developer(int dayworked):super(dayworked);
  
}

// Manager Class

class Manager extends Employee {
  
  
  @override 
  int salary (int perDaywage){
    
    return (this.dayworked*perDaywage+30);
  }
  
   Manager(int dayworked):super(dayworked);
}

As Dart has type inference , if you don't explicitly write the datatype , you won't notice how polymorphism is working . For this reason all the codes in this section has explicit datatype . If you take advantage of "type inference" , the polymorphism will still exits , but will seem less "magical"