Generics And Interfaces

/*
  Generics
  - Classes And Interfaces
*/

interface Book {
  itemType: string;
  title: string;
  isbn: number;
}

interface Game {
  itemType: string;
  title: string;
  style: string;
  price: number;
}

class Collection<T> {
  public data: T[] = [];
  add(item: T) : void {
    this.data.push(item);
  }
}

let itemOne = new Collection<Book>();
itemOne.add({ itemType: "Book", title: "Atomic Habits", isbn: 150510 });
itemOne.add({ itemType: "Book", title: "Follow Your Heart", isbn: 650650 });
console.log(itemOne);

let itemTwo = new Collection<Game>();
itemTwo.add({ itemType: "Game", title: "Uncharted", style: "Action", price: 150 });
console.log(itemTwo);