Creating an array of objects with their own properties in Javascript

Question

var i;


    var Book = new Array();
    var Book[0] = [title: "1984", author: "George Orwell", publisher: "Harvill Secker", price: "€8.99"];
    var Book[1] = [title: "Metro 2033", author: "Dmitry Glukhovsky", publisher: "Orionbooks", price: "€12.99"];
    var Book[2] = [title: "Always Outnumbered, Always Outgunned", author: "Walter Mosley", publisher: "W. W. Norton & Company", price: "€5.99"];    
    var Book[3] = [title: "Journey to the Center of the Earth", author: "Jules Verne", publisher: "Pierre Jules Hetzel", price: "€4.99"];

I'm trying to figure out how to make an array of objects that have their own properties but this doesn't seem to work. I can't understand what's going on.

EDIT:

    var i;
    var Book = new Array();
    Book[0] = {title: "1984", author: "George Orwell", publisher: "Harvill Secker", price: "€8.99"};
    Book[1] = {title: "Metro 2033", author: "Dmitry Glukhovsky", publisher: "Orionbooks", price: "€12.99"};
    Book[2] = {title: "Always Outnumbered, Always Outgunned", author: "Walter Mosley", publisher: "W. W. Norton & Company", price: "€5.99"};    
    Book[3] = {title: "Journey to the Center of the Earth", author: "Jules Verne", publisher: "Pierre Jules Hetzel", price: "€4.99"};

    for (i = 0; i < 4; i++)
    {
        document.write("Book: " + Book[i].title + "Author: " + Book[i].author "Publisher: " + Book[i].publisher + "Price: " + Book[i].price);
    }

This is the updated code. This still doesn't work.

EDIT 2: Was missing a "+" in the document.write.

Object literal notation uses curly brackets: {title: '1984', author: 'George...}. Square brackets are for array literals. — RobG
– RobG, Commented Feb 7, 2015 at 22:06
use Book[i].author + "Publisher: " instead of Book[i].author "Publisher: " — changtung
– changtung, Commented Feb 7, 2015 at 22:19

Rhumborl · Accepted Answer · 2015-02-07 22:10:03Z

2

You are passing array to your arrays, not objects.

Change [ for {, since second is proper object definition.

Don't use var twice. Once you have variable, you can use it without var.

var Book = new Array();

Book[0] = {title: "1984", author: "George Orwell", publisher: "Harvill Secker", price: "€8.99"};

You can use it like this:

alert(Book[0].title);

edited Feb 7, 2015 at 22:10

Rhumborl

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answered Feb 7, 2015 at 22:06

changtung

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3 Comments

raz789 Over a year ago

Okay I have done this and it still doesn't work and updating the original post. The objects do not print via document.write. Can I not use objects in that?

changtung Over a year ago

it works, but you have lack of + in your document.write parameter. write: Book[i].author +"Publisher: "

raz789 Over a year ago

Well. That's a huge mistake. Will update the top post.

Neysi Tuesta · Accepted Answer · 2015-02-07 22:11:24Z

The syntax is incorrect.

Array is: [ ] Object is: { }

Besides the Book variable must be declared once.

The correct way is :

 var Book = new Array();
 Book[0] = {title: "1984", author: "George Orwell", publisher: "Harvill Secker", price: "€8.99"};
 Book[1] = {itle: "Metro 2033", author: "Dmitry Glukhovsky", publisher: "Orionbooks", price: "€12.99"};
 Book[2] = {title: "Always Outnumbered, Always Outgunned", author: "Walter Mosley", publisher: "W. W. Norton & Company", price: "€5.99"};    
 Book[3] = {title: "Journey to the Center of the Earth", author: "Jules Verne", publisher: "Pierre Jules Hetzel", price: "€4.99"};

Or

Book.push ( {title: "1984", author: "George Orwell", publisher: "Harvill Secker", price: "€8.99"}) 
//...

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