如何使用 Class 语法将新的 Book 对象推入空数组？

Question

如果 class 声明中的构造函数已经创建了一本书 object，如果我考虑正确，我需要做的就是实例化对象，然后将该对象压入数组。我在这里错过了什么？

class Book{
  constructor(title, author, pages, hasRead, library=[]){
    this.title = title
    this.author = author
    this.pages = pages
    this.hasRead = hasRead
    this.library = library
  }

  
addBookToLibrary(){
   return this.library.push();
 }
}

//instantiate Book Object
let newBook = new Book();

//push the object into the empty array??
newBook.addBookToLibrary("A book", "Charlie Morton", "500", true);


console.log(newBook.library);

Answer 1

如前所述，最初您没有向 push 方法传递任何参数。如果您要创建一个数组数组，例如：

[ [ “一本书”， “查理莫顿”， "500", 真的 ], [ “两本书”， “查理莫顿”， "200", 错误的 ] ]

尽管我认为具有 key:value 配对的对象数组会更易于使用。

class Book{
  constructor(title, author, pages, hasRead, library=[]){
    this.title = title
    this.author = author
    this.pages = pages
    this.hasRead = hasRead
    this.library = library
  }
  
  addBookToLibrary(book){
     return this.library.push(book);
  }
}

//instantiate Book Object
const newBook = new Book();


//push the object into the empty array??
newBook.addBookToLibrary(["A book", "Charlie Morton", "500", true]);
newBook.addBookToLibrary(["Two book", "Charlie Morton", "200", false]);


console.log(newBook.library);

如何使用 Class 语法将新的 Book 对象推入空数组？

How can I push a new Book object into empty array using Class syntax?

javascript

refactoring

class