what is the reason for name begin undefined

Question

I have a class vehicle and car and motorcycle every output is correct except for the issue is within the class vehicle it tells me that the name and wheel are declared but never used

 class Vehicle { constructor(name, wheels) { this.name; this.wheels; } drive() { return 'Moving Forward'; } stop() { return 'Stopping'; } } class Car extends Vehicle { constructor(name, wheels) { super(name, wheels); } } class Motorcycle extends Vehicle { constructor(name, wheels) { super(name, wheels); } wheelie() { return 'Wheee!'; } } console.log(''); console.log('ES6 CLASSES'); console.log(''); let mazda = new Car('Mazda 3'); console.log('Car'); console.log('mazda.name', mazda.name); console.log('mazda.drive()', mazda.drive()); console.log('mazda.stop()', mazda.stop()); console.log(mazda); console.log('-------------------------------'); let harley = new Motorcycle('Fatboy'); console.log('Motorcycle'); console.log('harley.name', harley.name); console.log('harley.drive()', harley.drive()); console.log('harley.wheelie()', harley.wheelie()); console.log('harley.stop()', harley.stop());

I have a class vehicle and car and motorcycle every output is correct except for the issue is within the class vehicle it tells me that the name and wheel are declared but never used

Answer 1

You're not assigning anything to this.name and this.wheels , so you're not using the arguments that you declared in the constructor of Vehicle .

Try this:

class Vehicle {
  constructor(name, wheels) {
    this.name = name;
    this.wheels = wheels;
  }
  …
}