From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2013-04-11T18:05:09+09:00
Subject: Re: confusion with Struct class

On Thu, Apr 11, 2013 at 10:45 AM, Love U Ruby <lists@ruby-forum.com> wrote:
> I went to there - http://www.ruby-doc.org/core-2.0/Struct.html but the
> below mentioned not cleared.
>
> Customer = Struct.new(:name, :address)
> p Customer.class #=>class
>
> Struct.new("Customer", :name, :address)
> p Customer.class #`<main>': uninitialized constant Customer (NameError)
>
> Can anyone help me what's the difference between these two construct?
>

If you read the doc you referenced closely:

"Creates a new class, named by aString, containing accessor methods
for the given symbols. If the name aString is omitted, an anonymous
structure class will be created. Otherwise, ***the name of this struct
will appear as a constant in class Struct***, so it must be unique for
all Structs in the system and should start with a capital letter.
Assigning a structure class to a constant effectively gives the class
the name of the constant."

Check the part between ***

1.9.2p290 :001 > Struct.new("Customer", :name, :address)
 => Struct::Customer
1.9.2p290 :002 > p Struct::Customer
Struct::Customer
 => Struct::Customer
1.9.2p290 :003 > p Struct::Customer.class
Class
 => Class

Jesus.