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Solve real-life programming problems with a fraction of the code that pure object-oriented programming requires. Use Scala and Clojure to solve in-depth problems with two sets of patterns: object-oriented patterns that become more concise with functional programming, and natively functional patterns. Your code will be more declarative, with fewer bugs and lower maintenance costs.Functional languages have their own patterns that enable you to solve problems with less code than object-oriented programming alone. This book introduces you, the experienced Java programmer, to Scala and Clojure: practical, production-quality languages that run on the JVM and interoperate with existing Java. By using both the statically typed, type-inferred Scala and the dynamically typed, modern Lisp Clojure, you'll gain a broad understanding of functional programming.For each pattern, you'll first see the traditional object-oriented solution, and then dig into the functional replacements in both Scala and Clojure. These patterns are common in the functional world and deserve to become part of your problem-solving toolkit. On the object-oriented side, you'll see many common patterns, such as Command, Strategy, and Null Object. On the functional side, you'll learn core functional patterns such as Memoization, Lazy Sequence, and Tail Recursion.Each pattern helps you solve a common programming problem. Working through them gives you a set of patterns you can use to solve problems you come across while writing programs. Finally, you'll learn how to work your existing Java code into new Scala or Clojure projects. You can start off small, adding functional code little by little, so you can complement your existing knowledge with Scala and Clojure as these languages gain popularity on the JVM.What You NeedClojure 1.5 and Scala 2.10.Optionally, Eclipse with plugins.
- Sales Rank: #1170417 in Books
- Brand: imusti
- Published on: 2013-11-02
- Original language: English
- Number of items: 1
- Dimensions: 9.25" h x .54" w x 7.50" l, .98 pounds
- Binding: Paperback
- 250 pages
- Pragmatic Bookshelf
Amazon.com Review
Q&A with Michael Bevilacqua-Linn, author of "Functional Programming Patterns in Scala and Clojure"
Q. Why did you write "Functional Programming Patterns"?
A. Languages with a functional flavor are getting more and more mainstream, and I wanted to write something that would help folks with a lot of traditional OO pattern knowledge start to make the transition.
Q. I don't know Scala or Clojure. How hard would it be for me to understand the examples in the book?
A. This book is written for programmers who are new to Scala and Clojure, but who have significant experience with Java and object-oriented patterns. One of its goals is to help ease experienced object-oriented programmers into a more functional style.
Q. What can I do with functional patterns that I couldn't do before?
A. It's not so much what you can do, as what you can do better! Functional programming, and the patterns that go along with it, tends to be more declarative than imperative programming, so you can solve problems with code that's both more straightforward and shorter. The functional focus on immutable data reduces bugs in large programs, especially ones involving concurrency.
Q. Functional programming has no place in the object-oriented world, does it?
A. While object-oriented programming and functional programming are often seen as opposite paradigms, the truth is a bit more complex. Even Java is getting more of a functional style with Java 8's Lambdas. Scala explicitly blends object-oriented and functional styles. While Clojure is explicitly not object-oriented, it does borrow many good ideas from the object-oriented world, such as polymorphism and programming to interfaces.
Q. Which one should I use? Scala or Clojure? What are the differences and which would be easier to start with?
A. Scala tends to provide an easier on-ramp for object-oriented programmers, as they can start working with it in a mainly object-oriented style and transition to a more functional style as they gain more experience. Scala also has a sophisticated static type system, and blends object-oriented and functional programming together. Clojure, on the other hand, is a modern, practical Lisp and comes with the powerful macro system inherent to Lisps.
Both are excellent, general-purpose languages, but I have to confess that I prefer Clojure. I find that I can write clear, concise code it in much more easily than I can in any other language. However, knowing both will give you a very broad understanding of modern languages with a functional flavor.
5 Functional Programming Tips from Michael Bevilacqua-Linn, Author of “Functional Programming Patterns in Scala and Clojure”
Review
"This book is an absolute gem and should be required reading for anybody looking to transition from OO to FP. It is an extremely well-built safety rope for those crossing the bridge between two very different worlds. Consider this mandatory reading."
—Colin Yates, technical team leader QFI Consulting, LLP"This book sticks to the meat and potatoes of what functional programming can do for the object-oriented JVM programmer. The functional patterns are sectioned in the back of the book separate from the functional replacements of the object-oriented patterns, making the book handy reference material. As a Scala programmer, I even picked up some new tricks along the read."
—Justin James, developer, Full Stack Apps"This book is good for those who have dabbled a bit in Clojure or Scala but are not really comfortable with it; the ideal audience is seasoned OO programmers looking to adopt a functional style, as it gives those programmers a guide for transitioning away from the patterns they are comfortable with."
—Rod Hilton, Java developer and PhD candidate at the University of Colorado About the Author
Michael Bevilacqua-Linn has been programming computers ever since he dragged an Apple IIGS into his fifth grade class to explain loops and variables to pre-teenagers. He works for Comcast, where he builds distributed systems that power infrastructure for their next generation services. In his spare time he likes rock climbing and good beer, though not at the same time. He blogs at "mblinn.com":http://mblinn.com/.
Most helpful customer reviews
10 of 10 people found the following review helpful.
This is not functional programming book
By potix2
This is not functional programming book. This book is written for developers that be used to object-oriented programming and interested in functional programming. The first half is rewriting object-oriented design pattern by functional idioms but it's not functional style programming. The last half is about functional programming techniques(i.e. tail recursion, lazy sequence). If you want to learn functional style programming, I couldn't recommend it. You should read another great books like "Scala for the impatient", "Functional programming in scala", "The Joy of Clojure" and so on.
9 of 10 people found the following review helpful.
Challenging and clever
By Thomas Adkins
I like the approach of this book in that it uses a simple web server as its primary example. I find this very meaningful for my work, as much of my work has a networking component. I also like how it starts off with an imperative piece of code that is very similar to the way I, as an imperative programmer of many years, might have done it myself. The authors then take the problem apart from a functional perspective.
I think it is very important to avoid leading readers using only examples which are easily handled with a functional approach. This book achieves this with challenging material. I was surprised that I could not simply read the book and gain a rapid understanding, but had to go and really do the exercises with the author. I am told by a number of experts that this is typical for imperative-minded programmers. But I really want to learn functional programming, so I'm glad I purchased this book!
9 of 10 people found the following review helpful.
Not worth the price
By Zach Klippenstein
Can't believe I paid almost $20 for this. The explanations are repetitive and written in a very boring prose. The code examples are hugely oversimplified, and are neither practical nor interesting. Anyone with a half-decent understanding of these patterns could have thought them up, and most could probably do better. The Scala code is often not idiomatic (e.g. using Vectors instead of lists, constructed without the :: constructor). I can't speak for the Clojure, I'm not as familiar with the language.
For one of the more interesting patterns, Memoization, after showing a completely naïve Scala implementation that ignores generics doesn't even try to demonstrate how to correctly use the type system, and instead just hard-codes the specific types being used in the example, I was really curious about what the Clojure code would look like. Instead, he just says there's a standard function to do it. I'm glad it was mentioned, but I would expect a $20 book would at least compare implementations.
I've read blogs that are more in-depth, better-written, and have more useful code examples than this drivel. Don't buy.
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