The Perl and Raku Conference 2023 in Toronto

Closures – and anonymous subs in general – provide a simple, dynamic way to control code without huge if-blocks. Problem is that most people don’t know how to use them or why.

From testing to formatting to debug output, anonymous subs and closures make for simpler, cleaner, and often times faster code. This is a look at what anonymous subs can be used for and why closures are so helpful. The basic ideas work equally well in Perl and Raku and are presented with examples from both for testing, cleaning up if-logic, and making for faster, simpler code.