js__typescript__pluralsight1/app/classes.ts

import * as I from './interfaces';
import {CatalogItem, Inventory} from "./interfaces";

class UniversityLibrarian implements I.Librarian {
  department: string;
  email: string;
  name: string;

  assistCustomer(custName: string): void {
    console.log(`${this.name} is assisting ${custName}.`);
  }
}

export abstract class ReferenceItem {
  static department = 'Research';
  private _publisher: string;

  constructor(public title: string, protected year?: number) {
  }

  printItem(): void {
    console.log(`${this.title} was published in ${this.year}`);
    console.log(`Department: ${ReferenceItem.department}.`);
  }

  get publisher(): string {
    return this._publisher.toUpperCase();
  }

  set publisher(p: string) {
    this._publisher = p;
  }

  abstract printCitation(): void;
}

class Journal extends ReferenceItem {
  public contributors: string[];

  constructor(title: string, year: number) {
    super(title, year);
  }

  printCitation(): void {
    console.log(`${this.title} - ${JSON.stringify(this.contributors)}.`);
  }
}

class Catalog<T extends CatalogItem> implements Inventory<T> {
  private catalogItems = new Array<T>();

  addItem(newItem: T): void {
    this.catalogItems.push(newItem);
  }

  getAllItems(): Array<T> {
    return this.catalogItems;
  }

  getNewestItem(): T {
    return this.catalogItems.slice(-1)[0];
  }

}

export { Catalog, Journal, UniversityLibrarian };