TypeScript - Polymorphism

TYPESCRIPT 

TypeScript - Polymorphism

Create a class "Automobile" that has two protected properties and a method:

• fuelType and price
• initialize the properties using constructor
• printInfo(): displays "I am automobile" in console
• Now create another class "Car" which extends the above class and has two functions
• constructor: this initializes "fuelType" and "price" by invoking the base class constructor
• printInfo(): displays Fuel type and price of that object in a format specified below // overriding function

Fuel Type: <fuelType>

Price: <price>

Sample Output:

I am automobile

Fuel Type: Petrol

Price: 100

Note: Inputs are passed in the constructor of the class Car

Solution:

class Automobile {

  protected fuelType: string;

  protected price: number;

  constructor(theFuelType: string, thePrice: number) {

    this.fuelType = theFuelType;

    this.price = thePrice;

  }

  printInfo() {

    console.log("I am automobile");

  }

}

class Car extends Automobile {

  constructor(fuelType: string, price: number) {

    super(fuelType, price);

  }

  printInfo(): void {

    super.printInfo();

    console.log("Fuel Type: " + this.fuelType + "\nPrice: " + this.price);

  }

}

let newCarObject = new Car('Petrol',100)

newCarObject.printInfo()                                                                 

                       

Also check out -     TypeScript Inheritance                            TypeScript Class