From: Johnathon Wright <jw@...>
Date: 2010-07-09T23:50:05+09:00
Subject: Re: New, but this seems odd...

On Jul 7, 8:01 am, Andrew Wagner <wagner.and...@gmail.com> wrote:
> With this behavior, wouldn't "delete!" be a more appropriate name?

On Jul 7, 8:25 am, Rob Biedenharn <R...@AgileConsultingLLC.com> wrote:
> Is there some kind of interpretation of "delete" that doesn't imply  
> the receiving object will be changed?

After some reflection, I can certainly see how you would expect a
bang! there... when working with sets, you often want to manipulate a
set to form a different one.

guests = ['joe@person.test', 'jane@person.test', 'jules@person.test',
'me']
invitations_to_send = guests.delete('me')

and in fact there are enumerable operators that work that way...

guest_emails = ['joe@person.test', 'jane@person.test',
'jules@person.test', 'me']
guests = guest_emails.map{|email| Person.find_by_email( email ) }

whereas

guest_emails.map!{|email| Person.find_by_email( email ) }

So, yes, inconsistent. Sorry, not much that can be done now... :)

The way to do this would be ...

invitations_to_send = guests - ['me']

or just overwrite delete for your app... :)

jw

----------
Johnathon Wright
Web Application Consultant

http://www.mustmodify.com/