Press House

function solution() {
  class Article {
    constructor(title, content) {
      this.title = title;
      this.content = content;
    }
    toString() {
      return [`Title: ${this.title}`, `Content: ${this.content}`].join("\n");
    }
  }

  class ShortReports extends Article {
    constructor(title, content, originalResearch) {
      if (content.length >= 150) {
        throw new Error(
          `Short reports content should be less then 150 symbols.`
        );
      }
      if (
        !originalResearch.hasOwnProperty("title") ||
        !originalResearch.hasOwnProperty("author")
      ) {
        throw new Error(`The original research should have author and title.`);
      }
      super(title, content);
      this.originalResearches = originalResearch;
      this.comments = [];
    }

    addComment(comment) {
      this.comments.push(comment);
      return `The comment is added.`;
    }

    toString() {
      let result = [
        super.toString(),
        `Original Research: ${this.originalResearches.title} by ${this.originalResearches.author}`,
      ];
      if (this.comments.length > 0) {
        result.push(`Comments:`);
        this.comments.forEach((c) => result.push(c));
      }
      return result.join("\n");
    }
  }

  class BookReview extends Article {
    constructor(title, content, book) {
      super(title, content);
      this.book = book;
      this.clients = [];
    }

    addClient(clientName, orderDescription) {
      if (this.clients.find((c) => c.clientName === clientName) !== undefined) {
        throw new Error(`This client has already ordered this review.`);
      } else {
        this.clients.push({ clientName, orderDescription });
        return `${clientName} has ordered a review for ${this.book.name}`;
      }
    }

    toString() {
      let result = [super.toString()];
      result.push(`Book: ${this.book.name}`);
      if (this.clients.length > 0) {
        result.push(`Orders:`);
        this.clients.forEach((c) =>
          result.push(`${c.clientName} - ${c.orderDescription}`)
        );
      }
      return result.join("\n");
    }
  }
  return { Article, ShortReports, BookReview };
}