JavaScript MCQs – Object-Oriented Programming

class Vehicle {  
  constructor() {  
    this.type = "Car";  
  }  
}  
class Bike extends Vehicle {  
  constructor() {  
    super();  
    this.type = "Bike";  
  }  
}  
const bike = new Bike();  
console.log(bike.type);

function Shape() {  
  this.type = "shape";  
}  
Shape.prototype.getType = function () {  
  return this.type;  
};  
const circle = new Shape();  
circle.type = "circle";  
console.log(circle.getType());

class Parent {  
  constructor() {  
    this.name = "Parent";  
  }  
}  
class Child extends Parent {  
  constructor() {  
    super();  
    delete this.name;  
  }  
}  
const child = new Child();  
console.log(child.name);

class Animal {  
  constructor() {  
    this.legs = 4;  
  }  
}  
Animal.prototype.sound = "roar";  
const cat = new Animal();  
cat.sound = "meow";  
delete cat.sound;  
console.log(cat.sound);

class Gadget {  
  constructor() {  
    this.type = "gadget";  
  }  
}  
Gadget.prototype.showType = function () {  
  return this.type;  
};  
const phone = new Gadget();  
Gadget.prototype.type = "generic gadget";  
console.log(phone.showType());