Perl::...salIsa(3pm)

📦
version 1.156.0 · 12 versions
, in opensuse-leap 16.0

🎀 Perl::...salIsa(3pm) 🎀

okay so this page is from the User Contributed Perl Documentation, and it's your bestie-approved guide to the Perl::Critic policy with the extremely long name. No cap, we're keeping every detail. 💖

✨ NAME ✨

The policy is Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa, and its whole vibe is: write eval { $foo->isa($pkg) } instead of UNIVERSAL::isa($foo, $pkg). That's the exact NAME description, bestie. 💅

🌸 AFFILIATION 🌸

This Policy is part of the core Perl::Critic distribution. 🫶

🦋 DESCRIPTION 🦋

Here's the before-and-after, and it's giving very clear energy:

print UNIVERSAL::isa($obj, 'Foo::Bar') ? 'yes' : 'no';  #not ok
print eval { $obj->isa('Foo::Bar') } ? 'yes' : 'no';    #ok

As of Perl 5.9.3, the use of UNIVERSAL::isa as a function has been deprecated, and the method form is preferred instead. 💅

Formerly, the functional form was recommended because it gave valid results even when the object was undef or an unblessed scalar. But bestie, the functional form makes it impossible for packages to override isa(), and that technique is crucial for implementing mock objects and some facades. 😭

Another alternative to UNIVERSAL::isa is the _INSTANCE method of Param::Util, which is faster. 🔥

See the CPAN module UNIVERSAL::isa for an incendiary discussion of this topic. 👑

🎀 CONFIGURATION 🎀

This Policy is not configurable except for the standard options. So no extra knobs here, bestie — just the standard options. periodt. 💜

🌈 SEE ALSO 🌈

  • Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalCan — go peek at this one too. 🦋

🌟 AUTHOR 🌟

Chris Dolan <cdolan@cpan.org> 💖

Copyright (c) 2006-2023 Chris Dolan.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module. 🫶

okay that's the whole page, bestie — this one came from perl v5.42.0, dated 2024-10-23. slay. 💜

📦 where this page comes from