Getter and setter methods to control access to an object

Getters and setters are special methods that allow you to define how to access and mutate the properties of a class.

 

getterSetter.js 

class Person {
  constructor(name, age) {
    this._name = name;
    this._age = age;
  }

  // Getter
  get age() {
    return this._age;
  }

  // Setter
  set age(value) {
    if (value < 0) {
      console.log('Age cannot be negative.');
    } else {
      this._age = value;
    }
  }
}

const person1 = new Person('Krishna', 35);
console.log(`Age : ${person1.age}`);

person1.age = -5;
person1.age = 45;
console.log(`Age : ${person1.age}`); // Output: 45

Output

Age : 35
Age cannot be negative.
Age : 45

Getter method

get age() {
	return this._age;
}

The getter method is used to retrieve (or "get") the value of the _age property. When you access person1.age, JavaScript automatically calls the get age() method. This method returns the value of _age, allowing you to read it without directly accessing the _age property.

Setter Method

// Setter
set age(value) {
	if (value < 0) {
      console.log('Age cannot be negative.');
    } else {
      this._age = value;
    }
}

The setter method is used to set or update the value of the _age property. When you assign a value to person1.age (e.g., person1.age = 45), JavaScript automatically calls the set age(value) method. The method checks if the value is negative. If it is, it prints a warning message; otherwise, it updates _age with the new value.

 

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