Re: Wierd error message

Here is one way to generate that sort of warning message (there are many other ways):

my @array=qw/foo bar/;
$array[3] = "baz";

foo1( @array );  # $array[2] is undefined
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One way to avoid the warning would be:

   for my $param (grep {defined} @_) {
      for my $val ( split /\n/, $param ) {
         print "The value is: $val\n";  # or whatever you want to do
      }
   }
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(I took the liberty of eliminating unnecessary variables, and localizing the scope of needed variables a little more tightly.)

The other methods suggested above would also work, I expect. There might be reasons for preferring one approach over the other, depending on the rest of your application.

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Re^2: Wierd error message by herby1620 (Monk) on Aug 16, 2006 at 22:13 UTC
Reply most helpful. I was able to make the proper tests, and incorporate the detection of "undefined" stuff in my code. Sorry if the example isn't that good. I tried to extract the pertinant stuff for the example. The intended application is a "tie" method for output (prints). It replaces the output method to stdout, and adds the time, and module/line as a prefix. It seems to work quite well, as we've put it in a bunch of scripts here. Efficient? I don't know, it does the job, and really isn't called that much. I suspect that being my first module, it refelcts my background ("...you can program in Fortran in any language.").	[reply]

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Re^2: Wierd error message
by herby1620 (Monk) on Aug 16, 2006 at 22:13 UTC

Sorry if the example isn't that good. I tried to extract the pertinant stuff for the example. The intended application is a "tie" method for output (prints). It replaces the output method to stdout, and adds the time, and module/line as a prefix. It seems to work quite well, as we've put it in a bunch of scripts here. Efficient? I don't know, it does the job, and really isn't called that much. I suspect that being my first module, it refelcts my background ("...you can program in Fortran in any language.").

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