Edit Package perl-PerlX-Maybe

perl-PerlX-Maybe - Return a Pair Only If They Are Both Defined

Moose classes (and some other classes) distinguish between an attribute being unset and the attribute being set to undef. Supplying a constructor arguments like this:

my $bob = Person->new(
name => $name,
age => $age,

Will result in the 'name' and 'age' attributes possibly being set to undef (if the corresponding '$name' and '$age' variables are not defined), which may violate the Person class' type constraints.

(Note: if you are the _author_ of the class in question, you can solve this using MooseX::UndefTolerant. However, some of us are stuck using non-UndefTolerant classes written by third parties.)

To ensure that the Person constructor does not try to set a name or age at all when they are undefined, ugly looking code like this is often used:

my $bob = Person->new(
defined $name ? (name => $name) : (),
defined $age ? (age => $age) : (),


use PerlX::Maybe;

my $bob = Person->new(
(name => $name) x!!(defined $name),
(age => $age) x!!(defined $age),

A slightly more elegant solution is the 'maybe' function.

Source Files
Filename Size Changed
PerlX-Maybe-1.201.tar.gz 0000018147 17.7 KB over 2 years
cpanspec.yml 0000000669 669 Bytes over 2 years
perl-PerlX-Maybe.changes 0000001272 1.24 KB over 2 years
perl-PerlX-Maybe.spec 0000002803 2.74 KB over 2 years
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