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Re: shift and logical or

by mhearse (Hermit)
on Nov 17, 2012 at 01:20 UTC ( #1004272=note: print w/ replies, xml ) Need Help??

in reply to shift and logical or


my $val ||= "undefined"

Which is equivalent to:

if (!$val) { $val = "undefined"; }

Blocks of code like that tend to clutter up your code.

Also consider:

$val = ($val) ? "defined" : "undefined";

Which is equivalent to:

if ($val) { $val = "defined"; } else { $val = "undefined"; }

Also, remember perl evaluates expressions for truth.

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Re^2: shift and logical or
by Kenosis (Priest) on Nov 17, 2012 at 02:41 UTC

    Defined, undefined or false?

    use strict; use warnings; my $val = 0; print +($val) ? "defined" : "undefined"; # prints undefined print "\n"; print +(defined $val) ? "defined" : "undefined"; # prints defined undef $val; print "\n"; print +(defined $val) ? "defined" : "undefined"; # prints undefined

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