我怎样才能让这段Javascript代码更加干燥？

Question

这是奥丁项目的一项作业。当我进行测试时，我意识到这段代码很糟糕，因为它不是 DRY。我只会创造越来越多的书籍对象。我怎样才能让这个更干净？

let myLibrary = [];

    function Book(title, author, pages, hasRead){
      this.title = title;
      this.author = author; 
      this.page = pages;
      this.hasRead = hasRead;
    };
    
    function addBookToLibrary(newBook){
      return myLibrary.push(newBook)
    };
    
    let newBook = new Book("Wool", "Hugh Howey", "592", false);
    let lifeOfPi = new Book("Life of Pi", "Yann Martel", "392", false);
    
    addBookToLibrary(newBook);
    addBookToLibrary(lifeOfPi);
    console.log(myLibrary);

Answer 1

你可以做这样的事情，这样你就有了一个“BookLibrary”类。

// Make the class "BookLibrary"

var BookLibrary = function() { 

    
    this.myLibrary = [];


    this.addBookToLibrary = function(title, author, page, hasRead) {

        var newBook = {}; // a book new object to be stored to array

        newBook.title = title;
        newBook.author = author;
        newBook.page = page;
        newBook.hasRead = hasRead;

        this.myLibrary.push( newBook ); // add to collection of books

    }
    
}

// test demo

// instantiate the object 
var books = new BookLibrary();

// add some books
books.addBookToLibrary("Wool", "Hugh Howey", "592", false);
books.addBookToLibrary("Life of Pi", "Yann Martel", "392", false);

// see if it worked
console.log( books.myLibrary );