Introduction to Classes

    /************************************ 
    JAVASCRIPT STILL USES PROTOTYPES!!!
    class
    extends 
    constructor 
    super
    get 
    set 
    static
    ***********************************/ 

    class Vehicle{
        // each class will usually have a constructor method 
        constructor(_wheels){	
            this.numWheels = _wheels;
        }
    
        get wheels( ){                //gets, creates a method called "wheels"
            return this.numWheels;
        }
    
        set wheels(_wheels){          //sets creats a method called "wheels"
            this.numWheels = _wheels;
        }
    
        static accelerate( ){
            console.log('go faster');
        }
    
        static decelerate( ){
            console.log('go slower');
        }
    }

    let car = new Vehicle(4); 
    console.log(car.wheels);

    Vehicle.accelerate( );	    // Vehicle, here, is like the prototype for Car!
    
    class Car extends Vehicle{
        constructor(_wheels, _make, _model, _year){
            super(_wheels);	    // super calls the constructor of the Vehcile class 
            this.make = _make;
            this.model = _model; 
            this.year = _year;
        }
        info( ){
            console.log('The', this.make, this.model, 'was made in', this.year, 'and has', this.wheels, 'wheels');
        }
    }
     
    let ferrari = new Car(4, 'Ferrari', 'Testarossa', 1985); 
    ferrari.info( ); 

    Car.accelerate( );