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Re^2: Using undef scalar as arrayref

by shemp (Deacon)
on Aug 12, 2005 at 20:36 UTC ( [id://483398]=note: print w/replies, xml ) Need Help??


in reply to Re: Using undef scalar as arrayref
in thread Using undef scalar as arrayref

Ack, you're right about what you noticed about line 5. I goofed. You're also right about the defined test.

The only caveat i can think of is that if the $arrayref got set to an empty arrayref, i'd still not want to do the if conditional (in this situation). So i think the final will be: 

   if ( $arrayref && @$arrayref ) {

[download]
which will throw an exception if its not an arrayref.
I use the most powerful debugger available: print!

Replies are listed 'Best First'.
Re^3: Using undef scalar as arrayref
by Joost (Canon) on Aug 12, 2005 at 20:44 UTC
[reply]
[d/l]
[select]
      Actually the if is separate from the loop. If there are any elements in the arrayref a flag needs to be set for later that is separate from what is happening in the loop. So its something like this: 
         if ( $arrayref && @$arrayref ) {
      # set the flag
   }
   ...
   foreach my $element (@$arrayref) {
     # do stuff
   }

      [download]
      Of course i could set it in the loop, but then its being set multiple times.
      I use the most powerful debugger available: print!
[reply]
[d/l]

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