From: SonOfLilit <sonoflilit@...>
Date: 2007-02-18T22:15:50+09:00
Subject: Re: exit in a bloc DRY way...

Here in the list. How do you read the list? Myself, I'm subscribed to
it in my gmail account and have it all in a label, so for me it's
simply in the first page.

If you can't find it, google for ruby adopt-a-newbie.

Aur Saraf

On 2/18/07, Josselin <josselin@wanadoo.fr> wrote:
> On 2007-02-18 13:05:29 +0100, SonOfLilit <sonoflilit@gmail.com> said:
>
> > A google turns up this:
> >
> > In Ruby, break exits the block with value "nil". The caller must check
> > after each closure call to see if the value returned was "nil", and
> > break itself, if necessary. A side effect is that you can't return
> > "nil" from a block without terminating the calling structure. (As it
> > happens, this is almost always acceptable.)
> >
> > Use IRB to figure if indeed the standard methods that accept blocks do
> > this checking.
> >
> > contact.each {|c|  nb -= 1; exit;  if c.from == parameter } # the
> > second ; is definitely wrong
> >
> > Perhaps you meant:
> >
> > contact.each {|c| if c.from == parameter; nb -= 1; break; end }
> >
> > Well, if each is defined and the Enumerable mixin is mixed in (it
> > usually is), you get #find for free, so:
> >
> > $ ri Enumerable#find
> > -------------------------------------------------------- Enumerable#f
> > ind
> >      enum.detect(ifnone = nil) {| obj | block }  => obj or nil
> >      enum.find(ifnone = nil)   {| obj | block }  => obj or nil
> > ---------------------------------------------------------------------
> > ---
> >      Passes each entry in _enum_ to _block_. Returns the first for wh
> > ich
> >      _block_ is not +false+. If no object matches, calls _ifnone_ and
> >      returns its result when it is specified, or returns +nil+
> >
> >         (1..10).detect  {|i| i % 5 == 0 and i % 7 == 0 }   #=> nil
> >         (1..100).detect {|i| i % 5 == 0 and i % 7 == 0 }   #=> 35
> >
> >
> > So how about:
> >
> >
> > nb = -1 if contact.find{|c| c.from == parameter }
> >
> > ?
> >
> > This seems good.
> >
> > Plug: Have a look at the adopt-a-newbie thread
> >
> >
> > Aur Saraf
> >
> > On 2/18/07, Josselin <josselin@wanadoo.fr> wrote:
> >>  I wrote this code that's running well..
> >>            origin = false
> >>            contact.each {|c|  origin = true  if c.from == parameter }
> >>            nb -= 1 if origin
> >>
> >> is there any way to write it in one line ?  (exiting from the bloc when
> >> the condition is true)
> >> something like :
> >>            contact.each {|c|  nb -= 1; exit;  if c.from == parameter }
> >>
> >> tfyl
> >>
> >> joss
>
> thanks a lot !!  I love Ruby for that....  start from one point .. and
> logically go to the DRY way...  with
> Rubist help....
>
> where is this thread 'adopt a newbie' ....  ?
>
> joss
>
>
>