From: "Mark J. Reed" <markjreed@...>
Date: 2003-12-10T11:57:03+09:00
Subject: Re: nuby question re a method

On Tue, Dec 09, 2003 at 06:47:38PM -0800, Van Jacques wrote:
> 
> class AddressBook
>     def each
>         @persons.each { |p| yield p }  
>     end
> end
> 
> defining the method each on the Class AddressBook (an array of hashes;
> the addressbook is an array of persons, each person is a hash;
> his name, address, etc.)

Actually, an instance of the AddressBook class *contains* an array of persons
(in the @persons instance variable); it is not actually an array (it could be,
if it was declared "class AddressBook < Array", and used "self" instead of
"@persons").

> Question 1.
> Is this the same as the following?
> 
> class AddressBook
>     def each
>         @persons.each 
> 	       do |p|
> 	         yield p
> 	       end 
>     end
> end

Almost.  It's true that {...} and do...end are synonyms (although
they differ in precedence).  But do, like {, has to be on the same
line as the method call; @persons.each on a line by itself is a syntax error.

> Question 2. Is my terminology correct? If not, is the meaning
> clear enough?

Your terminology is fine!

-Mark