David T-G wrote at Wed, 12 Jun 2002 21:50:12 +0200:
> % I would try to write it as
> % while (<>) {
> % my ($artist, $album, $track) = split m:/:;
> % if ($track eq $foo) { # $foo eq "$foo" :-)
> % ...
> % }
> % }
>
> I don't see a difference here except that you're using a variable $foo where I threw
>in a constant
> foo because it wasn't really important. If the $track var in that example is
>undefined then it
> will throw an error, right? So I don't see how writing it that way (aside from the
>nicer split,
> which I'll also be doing in my next rewrite but at least I thought of it before
>someone had to
> show me :-) will improve matters...
>
The main difference is the position of my.
You set it out of the loop while it is here in the loop.
That's why $artist, $album and $track is undefined
at the beginning of every loop again.
(I also changed a little bit the regex from /\/// to m:/: what
I assume to be more readable, but that isn't very important
)
$foo was anything I didn't care much,
but "$foo" eq $foo is always right
and it's simpler to read, write and even quicker
>
> Interesting. One more reason not to know java, I guess ;-) <ducks>
>
As alread Lenin said:
You have to be an expert of the language of your enemies :-)
(free translated from german: "Du musst die Sprache des Feindes beherrschen")
>
> Hey, I could just undef *everything* between iterations and then I'd have a higher
>probability of
> finding one, eh? :-)
One, you didn't want it :-)
You'll understand it when you'll understand the philosophy of my/our/local
> % > I still don't quite get the whole "our"/"local" think yet. Still workin' on
>that. % % Oh, and
> I have always problems to explain it.
>
> No problem; I'll get there.
>
> Interesting... I just went to look for it in my 2e Camel book and can't find it
>(only my and
> local). Hmmm...
Take a look to the "Art of Computer Programming" by Donald Knuth.
Nothing similar to Perl, but to Programming in general (without 'OOP').
>
> I imagine and I can't wait :-) I need to really "get" OOP, too.
>
If there's anybody who needs it hardcore,
take a look to Modula-3 (again without OOP).
For OOP take a look to Damian Conway's books.
Cheerio,
Janek
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