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Re: undef-safe equality

by dragonchild (Archbishop)
on Apr 21, 2005 at 19:30 UTC ( #450169=note: print w/ replies, xml ) Need Help??

in reply to undef-safe equality

Write your own function. (This one is adapated from Test::Builder, the basis for Test::More's is() test.)

sub is_eq { my ($l, $r) = @_; if (defined $l && defined $r) { return $l eq $r; } else { return !defined $l && !defined $r; } }

Updated: Fixed typo in transcription from Test::Builder::is_eq()

Comment on Re: undef-safe equality
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Re^2: undef-safe equality
by tall_man (Parson) on Apr 21, 2005 at 19:46 UTC
    Your second return should be:
    return !defined $l && !defined $r;

    Otherwise, two undefs will compare unequal.

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