Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

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
Download Code
Replies are listed 'Best First'.
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.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://450169]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (7)
As of 2015-08-05 09:23 GMT
Find Nodes?
    Voting Booth?

    The oldest computer book still on my shelves (or on my digital media) is ...

    Results (80 votes), past polls