Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Re: check undef

by linuxer (Curate)
on Jun 23, 2009 at 09:33 UTC ( #773925=note: print w/replies, xml ) Need Help??

in reply to check undef

If you have to do these checks again and again, you can think of creating a dedicated sub routine for that.

sub all_defined { for my $i ( @_ ) { #return 0 if !defined $i; return if !defined $i; } return 1; } if ( all_defined( $WCkey, $SCkey, $Pkey, $Wkey, $Ukey ) ) { print "bla bla"; }

Update: modified code; thanks davorg

Replies are listed 'Best First'.
Re^2: check undef
by davorg (Chancellor) on Jun 23, 2009 at 09:40 UTC

    return 0 has a potentially dangerous effect. It will evaluate as true if your subroutine is called in list context. Just a bare return is usually a better idea.


    See the Copyright notice on my home node.

    Perl training courses

      Not better, different. Now it breaks under different circumstances.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://773925]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (11)
As of 2016-10-28 14:39 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (384 votes). Check out past polls.