Liskov Substitution Principal

liskov-substitution-principal.ts

abstract class Vehicle {
    protected speed: number;
    protected cubicCapacity: any;
    constructor(speed: number, cubicCapacity: number){
        this.speed = speed;
        this.cubicCapacity = cubicCapacity;
    }
    public getSpeed(): number {
        return this.speed;
    }

    public getCubicCapacity(): number {
        return this.cubicCapacity
    }

    public abstract speedUp(): void;
}

class Car extends Vehicle {
    private hatchedBack: any;
    constructor(){
        super(100, 10);
        this.hatchedBack = false;
    }
    public isHatchBack(): boolean {
        return this.hatchedBack
    }

    public speedUp(): void {
        this.speed += 10;
    }

}

class Bus extends Vehicle {
    private emergencyExitLocation: string;
    constructor(){
        super(60, 50);
        this.emergencyExitLocation = 'Budapest, Hosok ter';
    }

    public getEmergencyExitLocation(): string {
        return this.emergencyExitLocation;
    }
 
    public speedUp(): void {
        this.speed += 5;
    }

}



const car: Vehicle = new Car();
const bus: Vehicle = new Bus();

console.log(`speed of car is ${car.getSpeed()}`);
console.log(`capacity of car is ${car.getCubicCapacity()}`);
car.speedUp();
car.speedUp();
car.speedUp();
console.log(`speed of car is ${car.getSpeed()}`);

console.log('\n');

console.log(`speed of bus is ${bus.getSpeed()}`);
console.log(`capacity of bus is ${bus.getCubicCapacity()}`);
bus.speedUp();
bus.speedUp();
console.log(`speed of bus is ${bus.getSpeed()}`);