If you planned on using objects, you can consider using Moo for roles to allow composition, and combining it with Types::Tiny for type validation. There's also

If you planned on using objects, you can consider using Moo for roles to allow composition, and combining it with Types::Tiny for type validation. There's also Params::Validate for plain functions. The validation is unfortunately at runtime, but at least you get a clear error instead of unanticipated behavior. Moo (and it's bigger parent, Moose) can really help you structure your application better using roles. https://metacpan.org/pod/Moo https://metacpan.org/pod/Moo https://metacpan.org/pod/Type::Tiny https://metacpan.org/pod/Type::Tiny Edit: Don't use Params::Validate; kbenson's recommendation for Function::Parameters looks awesome!