Email the Author
You can use this page to email Jay Godse about Practical Data Processing Using Map, Reduce and Select with Ruby.
About the Book
This program prints out Pascal's triangle.
puts (0...10).reduce([[1]]) { |a,x|
a.unshift a.first.reduce([0,[]]) { |b,y|
[y,b.last << (b.first + y)]
}.last + [1]
}.reduce([]) { |c,z|
next [z[z.length/2].to_s.length*2,z.length,""] if c.empty?
[c[0],c[1], z.map { |j|
j.to_s.center(c[0])
}.join('').center(c[0]*c[1])+"\n#{c.last}"]
}.last
I found it on the internet at kellegous.com. How does such a complex program get encoded in 10 lines of code? Use this book to learn how to use map, reduce, and select with Ruby to solve data processing problems. Use this book along with a computer wth Ruby installed, a text editor, and the irb (interactive Ruby) prompt. As you read, type in the code, run the code and ponder the results. Tweak the code to test the code and the results. This book will walk you through problems and solutions which are effective because they use map, reduce, and select. You will gain a deeper understanding on how to break data processing problems into processing stages, each of which is understandable, debuggable, and composable, and how to combine the stages to solve your data processing problem.
About the Author
Jay Godse graduated with an engineering degree, and then went to work as a digital circuit designer. After a year of that he switched to software development and has been there ever since in some form. His early work was mostly real-time telecommunication device control and provisioning using languages such as C and Protel. He then transitioned into designing distributed computing systems, using languages such as C++ and CORBA IDL. After that, transitioned into web applications. Along the way he did stints as a software development manager and a software architect. But for the last 7 years, he has written web applications using Ruby on Rails, SQL, Javascript, et cetera. He is also a named inventor of a dozen US Patents owned by various companies.