Chromatic is a writer and free software programmer best known for his work in the Perl programming language.

He wrote Extreme Programming Pocket Guide and the lead author of Perl Hacks , co-wrote Perl Testing: A Developer's Notebook, and is an uncredited contributor[1] to The Art of Agile Development.

[4] In 2010, he released the book Modern Perl in print and in electronic form, with the latter redistributable freely (though with a suggested donation).

He is one of the biggest proponents of "roles" in Perl 6 (what some other programming languages refer to as "traits").

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