Higher-Order Perl

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Higher-Order Perl: Transforming Programs with Programs, is a book about the Perl programming language written by Mark Jason Dominus with the goal to teach Perl programmers with a strong C and Unix background how to use techniques with roots in functional programming languages like Lisp that are available in Perl as well, but less known. The book is often referred to as HOP. The provisional title of HOP was Perl Advanced Techniques Handbook.
In June 2013, a Chinese-language edition was published by China Machine Press.
The author has made the full text of HOP available in a derivative of Plain Old Documentation named MOD, and in PDF.