Custom Getters and Setters

Pre-calculation example

General syntax

void main() {
  
  
  // Custom  Getters & Setters



  var employee1 = Employee(); // Creating employee1 object
  
 
  employee1.id =1;
  employee1.name ="John Doe";
  employee1.position ="CTO";
  employee1.empsalary = 30; // Calling the custom setter method 
  
  
  
  
  print(employee1.empsalary); // Calling the custom getter method 
  
  
}

class Employee {
  int id;

  String name;

  String position;
   
  int salary ; 

  
  
 // You can remove the return type from setter method
   void set empsalary(int dayworked) {
    
      this.salary = dayworked*20;    
  }
  
  
  
  int get empsalary{
  
    return this.salary; 
  
  }
  
  
  
  
  
  
}

Without "this"

void main() {
  
  
  // Custom  Getters & Setters



  var employee1 = Employee(); // Creating employee1 object
  
 
  employee1.id =1;
  employee1.name ="John Doe";
  employee1.position ="CTO";
  employee1.empsalary = 30; // Calling the custom setter method 
  
  
  
  
  print(employee1.empsalary); // Calling the custom getter method 
  
  
}

class Employee {
  int id;

  String name;

  String position;
   
  int salary ; 

  
  
// You can remove the return type from setter method
 
   void set empsalary(int dayworked) {
    
      salary = dayworked*20;    
  }
  
  
  
  int get empsalary{
  
    return salary; 
  
  }
  
  
  
  
  
  
}

Shorthand notation

void main() {
  
  
  // Custom  Getters & Setters



  var employee1 = Employee(); // Creating employee1 object
  
 
  employee1.id =1;
  employee1.name ="John Doe";
  employee1.position ="CTO";
  employee1.empsalary = 30; // Calling the custom setter method 
  
  
  
  
  print(employee1.empsalary); // Calling the custom getter method 
  
  
}

class Employee {
  int id;

  String name;

  String position;
   
  int salary ; 

  
  
 // You can remove the return type from setter method
   void set empsalary(int dayworked) => this.salary = dayworked*20;    
  
  
  
  
  int get empsalary => this.salary;
  
   
  
  
  
  
  
}

Shorthand+ without "this"

void main() {
  
  
  // Custom  Getters & Setters



  var employee1 = Employee(); // Creating employee1 object
  
 
  employee1.id =1;
  employee1.name ="John Doe";
  employee1.position ="CTO";
  employee1.empsalary = 30; // Calling the custom setter method 
  
  
  
  
  print(employee1.empsalary); // Calling the custom getter method 
  
  
}

class Employee {
  int id;

  String name;

  String position;
   
  int salary ; 

  
  
   // You can remove the return type from setter method
   void set empsalary(int dayworked) => salary = dayworked*20;    
  
  
  
  
  int get empsalary => salary;
  
   
  
  
  
  
  
}

I mentioned you can remove the return type from setter method without any problem, but

you can actually also remove return type from getter method also without any problem . Dart compiler can assume the return type

Without any return type

void main() {
  // Custom  Getters & Setters

  var employee1 = Employee(); // Creating employee1 object

  employee1.id = 1;
  employee1.name = "John Doe";
  employee1.position = "CTO";
  employee1.empsalary = 30; // Calling the custom setter method

  print(employee1.empsalary); // Calling the custom getter method
}

class Employee {
  int id;

  String name;

  String position;

  int salary;

  // You can remove the return type from setter method
  set empsalary(int dayworked) => salary = dayworked * 20;

  // You can remove the return type from getter method also 
  get empsalary => salary;
}

Pre checking example

void main() {
  
  
  // Custom  Getters & Setters



  var employee1 = Employee(); // Creating employee1 object
  
 
  employee1.id =1;
  employee1.name ="John Doe";
  employee1.position ="CTO";
  employee1.empsalary = 30; // Calling the custom setter method 
  
  
  
  
  print(employee1.empsalary); // Calling the custom getter method 
  
  
}

class Employee {
  int id;

  String name;

  String position;
   
  int salary ; 

  
  
 // You can remove the return type from setter method
   void set empsalary(int dayworked) {
     
     if(dayworked<=31)
     {
       this.salary = dayworked*20;    
       
     }
     
     else{
       
       
       this.salary = -1;    
       
       
     }
    
      
  }
  
  int get empsalary{
  
    return this.salary; 
  
  }
 
}

Custom Setter

Custom Getter

You can also use custom getters and setters as an "alias" for the original instance variables.