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

If a constructor in the class declaration already creates a book object, If i'm thinking about this correctly, all I would need to do is instantiate the object, then push that object into an array. What am I missing here?

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);

CodePudding user response：

As stated, originally you were not passing any arguments to your push method. If you are looking to create an array of arrays like:

[ [ "A book", "Charlie Morton", "500", true ], [ "Two book", "Charlie Morton", "200", false ] ]

Though I think an array of objects with key:value pairing would make it easier to use.

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);

CodePudding user response：

addBookToLibrary need book argument and then push book object

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
let newBook = new Book();

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


console.log(newBook.library);