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Exercise 2

Create a Book class with private fields title, author, and year. Provide getters for each field and a setter for the year field that raises a RangeError if year is before 1900.

class Book {
  // your code here
}

let book = new Book('The Great Gatsby', 'F. Scott Fitzgerald', 1925);
console.log(book.title);  // The Great Gatsby
console.log(book.author); // F. Scott Fitzgerald
console.log(book.year);   // 1925

book.year = 1932;         // Changing year
console.log(book.year);   // 1932

try {
  book.year = 1825;
} catch (e) {
  console.log(e);   // RangeError: Invalid year
}

try {
  let book2 = new Book('A Tale of Two Cities', 'Charles Dickens', 1859);
} catch (e) {
  console.log(e);   // RangeError: Invalid year
}

Solution

class Book {
  //highlight
  #title;
  #author;
  #year;

  constructor(title, author, year) {
    this.#title = title;
    this.#author = author;
    this.#year = year;
  }

  get title() {
    return this.#title;
  }

  get author() {
    return this.#author;
  }

  get year() {
    return this.#year;
  }

  set year(newYear) {
    if (newYear < 1900) {
      throw new RangeError('Invalid year');
    } else {
      this.#year = newYear;
    }
  }
  //endhighlight
}

// test code omitted for brevity

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