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Re: Perl: last evaluated value as a returned value for a subroutine. See inside

by LanX (Chancellor)
on Feb 21, 2013 at 17:00 UTC ( #1019983=note: print w/ replies, xml ) Need Help??


in reply to Perl: last evaluated value as a returned value for a subroutine. See inside

your output must be wrong, only the first call should print "some string".

EDIT: now I get it, the sub returns the evaluation from the unless-condition in the first line.

... WTF ...

You like obfuscation, don't you?

> are there any conditions when Perl would NOT print "some string" in last two lines of code

sure if you set $R to anything false ( EDIT:... it will start from new, otherwise it will print the new value.)

if you wanna avoid that anyone ever unintentionally changes $R, then put the whole closure construct into braces and $R is out of scope for any other code.

{ my $R; sub mySub { unless ($R) { print "CONDITION WORKS\n"; $R = 'some string'; } } }

Cheers Rolf

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