Re: Re: Use of uninitialized value in array element

[TexasTess]

This node falls below the community's threshold of quality. You may see it by logging in.

[Fastolfe]

The presence of a dollar-sign is not the issue. The value of the variables at this point in the program is what's suspect:

my $a;        # undef
my $b = 1;

my @array = (
        [4, 3],
        [2, 1],
);

print $array[$b]->[$b]; # 1
print $array[$b]->[$a]; # Use of uninitialized value in array element,
+ but prints 2
print $array[$a]->[$b]; # Use of uninitialized value in array element,
+ but prints 3

The undefined value has a numeric value of 0, so it all "works" because of Perl's DWIM nature, but through the grace of warnings we know that something is amiss if we expect that our index variables should always have a numeric value.

[TexasTess]

Thanks for the clarification, I had NOT Experienced this in any of my perl works....and as a result am doomed for perl monk dumbassdom....

TexasTess
"Great Spirits Often Encounter Violent Opposition From Mediocre Minds" --Albert Einstein