From: Minero Aoki <aamine@...>
Date: 2002-03-04T15:04:52+09:00
Subject: Re: ruby-dev summary 16040-16125

Hi,

  In mail "Re: ruby-dev summary 16040-16125"
    MENON Jean-Francois <Jean-Francois.MENON@meteo.fr> wrote:

> >       st = Struct.new(:name => 'ruby', :age => 9)

> what is the difference with using Object instance variables ?
> 
>        st = MyStruct.new(name => 'ruby', age => 9)

In your example, MyStruct class must exist before you use it.
But Struct.new(...) way does not need such preparation.

By the way, you cannot use 'name' without quotes or colons.
It should be

         st = MyStruct.new(:name => 'ruby', :age => 9)
                            or
         st = MyStruct.new('name' => 'ruby', 'age' => 9)


> >           return Struct.new(:name => 'ruby, :age => 9)

> what is the difference with:

>           return Hash.new(name => 'ruby', age => 9)

At first, retval.name is 2 chars shorter than retval[:name]  :-).

Second, we can write parameter name in the source code
as syntax (not value). So, for example, typo causes NameError.

-- Minero Aoki