Re^4: Moose and default values

Indeed; it has no ties to Moose. It's simply a function that takes a list and returns a (possibly smaller) list. While it's handy to use it with Moose/Mouse/Moo constructors, it can be used with any functions that take a list of key-value pairs that you want to filter out undefs from.

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

Comment on Re^4: Moose and default values

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Re^5: Moose and default values by morgon (Priest) on Feb 20, 2013 at 22:42 UTC
It's nice (and only 10 lines of code :-=). But say I now wanted not only undefs but everything that is false (e.g. also an empty string) to trigger the default? Does Moose not have any mechanics for that?	[reply]
Re^6: Moose and default values by tobyink (Canon) on Feb 20, 2013 at 22:54 UTC
Maybe something along the lines of: `around BUILDARGS => sub { my $orig = shift; my $self = shift; my $params = $self->$orig(@_); $params->{$_} \|\| delete $params->{$_} for qw/ foo bar /; return $params; };` [download] This will discard false parameters for the "foo" and "bar" attributes. `package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name`	[reply] [d/l]
Re^7: Moose and default values by morgon (Priest) on Feb 20, 2013 at 23:02 UTC
Sure you can always hack togther something, I was more looking for a way to do such things declaratively... But your Haskell-ripoff is a at least a step forward - thanks.	[reply]
Re^8: Moose and default values by tobyink (Canon) on Feb 20, 2013 at 23:15 UTC
Re^9: Moose and default values by morgon (Priest) on Feb 20, 2013 at 23:28 UTC
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Think about Loose Coupling
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