Instance method in Dart with examples

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Instance methods in Dart :

In simple words, instance methods are methods defined in a class those are available with class objects. Instance methods can access to instance variables and this. For example, let’s consider the below program :

class Student {
  final String name;
  final num age;

  const Student(this.name, this.age);

  bool isAgeEven() {
    return age % 2 == 0;
  }
}

main() {
  var alex = Student("Bob", 30);

  print("isEven : ${alex.isAgeEven()}");
}

Here, isAgeEven is an instance method to check if the age of a Student is even or not. It returns one boolean value.

Using getter and setter methods :

Getter and Setter methods are used to get or read variables and set or write variables. These methods are written using get and set keywords.

class Student {
  final String name;
  num age;

  Student(this.name);

  set setAge(num age) => this.age = age;
  num get getAge => this.age;
}

main() {
  var alex = Student("Bob");
  alex.setAge = 10;
  print("Age : ${alex.getAge}");
}

Dart instance method

Each instance variables has an implicit getter and setter. You can use . to get/set one instance variable.

Similar tutorials :

Categories: dart

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