Benjamin Tan Wei Hao [Benjamin Tan Wei Hao] - Mastering Ruby Closures
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Mastering Ruby Closures: summary, description and annotation
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The road to Ruby mastery is paved with blocks, procs, and lambdas. To be a truly effective Ruby programmer, its not enough just to understand these features - you need to know how to use them in practice. Discover how to write code that is elegant, expressive, and a joy to use, and gain a deep understanding of these concepts so you can work with third-party gems and libraries more easily. Whether you are completely new to Ruby or a seasoned Rubyist, youll find good use for these concepts in your code.
Ruby developers use the Ruby language as the yardstick for expressivity, flexibility, and elegance - and a large part of this is due to blocks, lambdas, and procs. These language features make Ruby one of the most beautiful and pleasant languages to work with. Learn how to understand and craft code that will take you closer to Ruby mastery.
Start with the basics of closures and then dive into blocks, as you learn about the patterns that involve blocks, and how they are used in real-world code. Then create and use procs and lambdas. Finally, build your own lazy enumerables with advanced Ruby features such as fibers and generators. Along the way, work with computer science concepts such as closures, free variables and first-class functions. Spot a closure easily. Identify the patterns where you can effectively use blocks and re-implement common standard library methods using them. Trace through how Symbol#to_proc works and find out the different ways of calling procs. This succinct guide takes you through the different kinds of Ruby closures with engaging examples, and each chapter comes with exercises that test and challenge your understanding.
When you finish this book, blocks, procs, and lambdas will have become an integral part of your Ruby toolbox.
What You Need:Ruby 2.x and a basic familiarity with Ruby.
Benjamin Tan Wei Hao [Benjamin Tan Wei Hao]: author's other books
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Every precaution was taken in the preparation of this book. However, the publisher assumes no responsibility for errors or omissions, or for damages that may result from the use of information (including program listings) contained herein.
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To my parents, Virginia and Michael, and to my favorite girls in the world, Hui Ling and Gu Gu.
This is an excellent book for experienced Ruby developers to add functional programming paradigms to their toolkit. This book gives excellent examples of blocks, Proc s, and lambdas and ways to use them in your existing application.
| Jeffrey Holland |
| Senior software engineer, Ackmann & Dickenson |
Ive been a Rubyist for over a decade, and I still learned several new techniques and how to avoid gotchas with Proc s, lambdas, and blocks. This book is also perfect for the Ruby/Rails developer who wants to feel confident when consuming or writing libraries that use Rubys closures. Easy to understand, interesting examples, and a solid reference.
| Matthew Margolis |
| Director, software engineering, Getty Images |
Youve probably called methods that take in a block, but if youve not written a method that takes in a block, I highly recommend this book to you. Once youre through with the book, youll be able to explain how [1, 2, 3].map(&:to_s) works with confidence. Ive always been a fan of Benjamins writing because every concept is always followed up by real-world examples, which makes it easier for the reader to grok the concepts being taught.
| Tan Guo Xiang |
| Software engineer, Civilized Discourse Construction Kit |
I never heard Ruby could do closures, but Mastering Ruby Closures brought me from zero to hero in just a few hours! Dont be afraid, and take a look yourself!
| Gbor Lszl Hajba |
| Software engineer, Zhlke Engineering |
Acknowledgements
Even though this is my second published book, the sheer amount of work that goes into taking the book from conceptualization to the final product still amazes me, even for a short book like this. I need to thank a bunch of people who suffered with me through this arduous journey:
My Leanpub Readers:
This book originally started life on Leanpub. To all the readers who bought version 1.0, thank you for your patience and kind words. I hope it was worth the wait.
The Publishers:
Susannah Pfalzer and Brian Hogan, thank you for taking a chance on me and believing in the book. It is such an honor to be part of the Prag family. Without your gentle prodding, this project would have taken much, much longer. More importantly, thank you for making me a much better author.
The Reviewers:
Rohit Arondekar, Chad Dumler-Montplaisir, Jeff Holland, Gbor Lszl Hajba, Matthew Margolis, and Kim Shrieryour sharp eyes have saved me from many embarrassing mistakes. If any one of you ever write a book, Ill return the favor.
My Wife:
The idea for this book came to me while I was waiting for you to come out of the restroom during our honeymoon in Taiwan. Without that, this book would never have been written. The support that you gave me could never be overstated. I cannot promise that I will not write a third book...
My Parents:
As usual, thanks for everything. Although you might not understand anything in the book, this was written for you both.
Welcome!
Welcome to the Ruby closures book! You have taken a very important step toward becoming a better Ruby developer.
Closures are used everywhere in Ruby, from simple scripts to the most popular web frameworks. You might have even been using closures without knowing it.
However, once you become familiar with closures and their features, they will start jumping out at you, and youll appreciate the ways in which closures enable expressive and beautiful programs. But closures do more than that, especially in Ruby. Closures allow you to extend the language by enabling you to write your own domain-specific languages, or DSLs.
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