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Product details
File Size: 36629 KB
Print Length: 600 pages
Publisher: Morgan Kaufmann; 1 edition (March 31, 2005)
Publication Date: March 31, 2005
Sold by: Amazon Digital Services LLC
Language: English
ASIN: B006L1ZV5G
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I had originally planned to read Higher Order Perl and write my review immediately. When it became clear that I wasn't going to read HOP straight through, I figured I'd write a review when I was done. More and more, it looks like my reading of the last two chapters is being indefinitely delayed. I'm going to write what I think so far, while it's still more or less fresh in my mind.Higher Order Perl was originally going to be given some fairly bland name, like "Handbook of Advancted Perl Techniques." This would have been a spot-on (but uninteresting) title. HOP provides the reader with explanation and demonstration of techniques for problem-solving that are often overlooked. The examples are complex and detailed, but not byzantine, and they're built up slowly, piece by piece, so that each line of code's meaning and significance are made clear.The title "Higher Order Perl" refers to the book's most central technique, functional programming. While many programmers understand how to abstract a specific solution into a more general one, Dominus helps the reader learn to push the envelope, abstracing generic solutions into extremely generalized solutions that can be applied to seemingly-unrelated problems. This is frequently done by the construction of functions that build functions that build functions -- and so on, functions all the way down. Instead of solving the problem in base, earthly Perl, the programmer produces Perl elements of a higher order which, operating in harmony, become all things to all people.Well, I'm hyperbolizing, but I think it would be hard for me to over-emphasize the value of techniques like closures, iterators, and currying. They are, in part, what make Lisp so powerful, and the marriage of Lisp's power and Perl's expressivity is a happy one.As for the writing, it is good. The language is clear and the material is well-presented. One should be cautioned, though, that the book is dense. Dominus is constantly pressing onward, explaining new techniques or new ways to apply already-explained techniques. I found myself reading each page carefully and deliberately, only to turn back to it a few pages later, to be sure that I understood how the new material was relying on the old. It made the book a challenge to read, but it was a thoroughly enjoyable challenge. I never felt so frustrated by a bizarre idea that I gave up or so bored with an over-explained one that I skipped ahead.Finally, while the techniques that Dominus presents are powerful and advanced, the required knowledge of Perl is not particularly great. Because he clearly explains the key Perl concepts that he uses (especially closures and associated scoping issues), any competent programmer with a working knowledge of Perl should be able to put the ideas in Higher Order Perl to work.For serious Perl programmers, Higher Order Perl is a must-read book.
This is not a great book about Perl.It is a great book about higher-order programming, which happens to use Perl to illustrate these concepts. Those concepts are directly translatable to other dynamic languages like Python and Ruby.Simply put, higher order programming is writing programs which write programs. This is an extraordinary powerful technique which can create higher-performing applications with less effort.
I bought this book because the price was right, but i was overwhelmed by the actual content. This is clearly a book for the expert perl coder, and i barely consider myself a beginner. You will certainly see some code examples that are quite impressive in what can be done in a few short lines of perl, and even if you are a long-time perl hacker I can't see anyone not benefitting from reading this book.
I am NOT a SW guy - I am a perl autodidact HW engineer. I have written some pretty BIG "scripts" that get the job done - but a fringe "benefit" to me from the demise of the previous company I worked for is that I DON'T HAVE to maintain those scripts - a big bowl of spaghetti :(I tried several times to learn the OO side of Perl but this stuff was w-a-a-a-a-y out there for my scull :(HOP just made it for me! I wish it was available 5 years ago so I wouldn't waste my time writing the aforementioned spaghetti! Study it! It will twist your brains to the point of pain but stick with it - well worthed - you won't look at scripting/programming the same old way ever again!vess
Probably the best advanced Perl book, and this from someone who has all the O'Reilly books. I have seen too many Perl books written by C++ authors. This one talks about advanced topics in the way that Perl best handles it: not how C++ handles it and then translated to Perl.
Many in the Perl community have been eagerly awaiting Higher Order Perl, and they will not be dissapointed. Not only is this a great Perl book, it's one of the best general computer science texts I've read in a long time. Dominus focuses on the functional, LISP-like aspects of Perl, breaking readers of the procedural habits they have developed writing Perl code. The book starts with a few simple examples of callbacks and closures, and quickly moves on to developing functions that dynamically manufacture and return other functions. These techniques are used to their fullest potential as Dominus shows us how to use dynamic iterators to eliminate recursion; an invaluable technique considering Perl's lack of tail call optimization. Further techniques include using iterators to transform other iterators (analagous to Perl's map function), currying, using linked lists to create "lazy" streams that produce their data upon request, and function memoization. Dominus also makes digressions into Perl internals, giving the reader a magnificent depth of understanding about how these techniques actually function under the hood.
Read it years ago and it seemed academic and not very useful, then recently I had to process some large amount of data (not extremely large, only some 25GB) and remembered about inline caching (Chapter 3, "Caching and Memoization") and closures, and managed to cut the ETL time from weeks to less than two days without hogging processor time or memory, and query time from hours to minutes. Not all that was due to HOP but the initial gains due to inline caching pretty much saved the project.It is well worth the 40$ I paid in 2013 for the Kindle edition. If the author will ever publish a new and expanded edition I'll get that too.
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