Getters And Setters Customization

Getters and Setters may accept more than 1 arguments and have customized logic.

To do that functions acting as getters and setters need to be created.

Customized Getter

class Square { // Customized getter: getSide(roundUp) { if(roundUp) { return Number.parseFloat(this._side.toFixed(2)) } return this._side; } get area() { return this._side * this._side; } set side(sideValue) { this._side = sideValue; } } let square = new Square(); square.side = 1.0002; console.log('Side = ' + square.getSide(false)); console.log('Round up side = ' + square.getSide(true)); console.log('Area = ' + square.area);

Output:

Side = 1.0002 Round up side = 1 Area = 1.00040004

Explanation:

• The customized getter (defined at lines 3 - 9) accepts one parameter - roundUp.
• The getter for area property is used at line 25. It's function does not accept any arguments. This means that the function behaviour cannot be dependant on arguments (like roundUp).

Customized Setter

class Person { // Customized setter: setNames(firstName, middleName, lastName) { this._firstName = firstName; this._middleName = middleName; this._lastName = lastName; } get firstName() { return this._firstName; } get middleName() { return this._middleName; } get lastName() { return this._lastName; } get age() { return this._age; } set age(ageValue) { this._age = ageValue; } } let person = new Person(); person.age = 23; person.setNames('Emily', 'Johnson', 'Smith'); console.log('First Name: ' + person.firstName); console.log('Middle Name: ' + person.middleName); console.log('Last Name: ' + person.lastName); console.log('Age: ' + person.age);

Output:

First Name: Emily Middle Name: Johnson Last Name: Smith Age: 23

Explanation:

• At line 33 the age setter (defined at lines 26 - 28) is used. It accepts only one parameter.
• The setNames setter accepts many parameters and can have a behaviour based on the accepted parameters.