> -----Original Message-----
> From: drieux [mailto:[EMAIL PROTECTED]]
> Sent: Monday, May 20, 2002 3:01 PM
> To: cgi cgi-list
> Subject: Re: Counting the elements of an array
>
>
>
> On Monday, May 20, 2002, at 08:13 , Bob Showalter wrote:
> >> -----Original Message-----
> >> From: drieux [mailto:[EMAIL PROTECTED]]
> >>
> >> #------------------------
> >> #
> >> sub haveMap {
> >> my (@list) = @_;
> >> my %seen = ();
> >>
> >> map {$seen{$_}++} @list;
> >
> > So, is the old saw about "don't use map() in a void context" out
> > the window?
>
> you will have to explain this 'old saw' to 'this old dog'
> as this is the first time I have heard it....
perldoc -q 'What's wrong with using grep or map in a void context?' says:
Both grep and map build a return list, regardless of their context.
This means you're making Perl go to the trouble of building up a
return list that you then just ignore. That's no way to treat a
programming language, you insensitive scoundrel!
perldoc perlstyle says:
o Avoid using grep() (or map()) or `backticks` in a void
context, that is, when you just throw away their
return values. Those functions all have return
values, so use them. Otherwise use a foreach() loop
or the system() function instead.
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