Higher-Order Perl

Higher-Order Perl: Transforming Programs with Programs (ISBN 1-55860-701-3), 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.