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It's not that bad, at least in perl, as it appears to optimize it away. At least, on ActivePerl 5.8.4, the following script:
#! perl $x = 3; if(0 || $x == 2 || $x == 3) { print "Yeah!\n"; }
under `perl -MO=Deparse test.pl`, produces:
test.pl syntax OK $x = 3; if ($x == 2 or $x == 3) { print "Yeah!\n"; }

In general, I prefer my "||" on the right:

$x = 3; if( $x == 2 || $x == 3) { print "Yeah!\n"; }

If you want, you can still append "|| 0" to the condition, allowing for more symmetry, but not optimized away. At least it'll only be executed if every other condition fails.

There's a reason why Perl accepts lists ending with ",", or at least: it's a good thing Perl accepts lists ending with ",". In a way it's too bad (tough understandable) it won't do the same for "||".


In reply to Re^3: Pearls (not really) of Perl programming by bart
in thread Pearls (not really) of Perl programming by PetaMem

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