Date: 10 Sep 2001 21:45:45 -0400
From: stanb@panix.com (Stan Brown)
Subject: Re: Probelm with undefined atgumnets
Message-Id: <9njqc9$e2m$1@panix2.panix.com>

In <9nj09f$bum$1@mamenchi.zrz.TU-Berlin.DE> anno4000@lublin.zrz.tu-berlin.de (Anno Siegel) writes:

>According to Stan Brown <stanb@panix.com>:
>> A kind member of this group showed me a neat trick to print out the
>> arguments to a given function. It goes like this:
>> 
>> join ', ', map { "Arg$_ ->$_[$_]<-" } 0 .. $#_;
>> 
>> This works great _except_ when I pass in undef for an argumentm then I get
>> a warning about concatenating an unitliazed variable. 
>> 
>> How can I improve thsi to allow for this case?

>    join ', ', map "Arg$_ " . ( defined $_[$_] ? "->$_[$_]<-" : '-undef-'),
>        0 .. $#_;

>Or switch off the offending warning locally, but then you won't see
>the difference between "" and undef.

Cool! 

Thnaks for the help!