This document compares Scala and Ruby programming languages. It discusses their similarities in syntax and semantics, as well as differences in their standard library approaches and community cultures. The author argues that the Scala community could benefit from aspects of Ruby's community, such as establishing a "Scala way" and being less dismissive of newcomers. The document also suggests Scala could improve its standard libraries for common scripting tasks.

1. Scala and Ruby
- Similarities and Differencies-
Ubiregi Inc.
Japan Scala Users Group
Kota Mizushima

2. Self-Introduction
● Kota Mizushima
– Ubiregi Inc.
– Leader of Japan Scala Users Group
– Use Ruby (RoR) and Obj-C mainly
– Plan to use Scala (Finagle) internally
● Programming Language Geek
– I love Nemerle, Scala, and so on.

5. Purpose of This Presentation
●
Catch Scala beginners
– To use in production
● Decrease complaint about Scala language
– from other language developer
● Learn from Ruby community

6. Ruby and Scala ?

7. ● Dynamically Typed
● Object Oriented
● Many Syntax Sugar

8. ● Statically Typed
● Object Oriented + Functional
● Many Syntax Sugar

9. Similarities
●
Syntax
– Function as last method parameter
– Pseudo control structure using method call
● Semantics
– Method is not first-class value
– Behavior of return in anonymous function

10. [1, 2, 3, 4, 5].each do{|x|
puts x
}
[1, 2, 3, 4, 5].inject(0){|x, y| x + y}

11. List(1, 2, 3, 4, 5).foreach{x =>
println(x)
}
List(1, 2, 3, 4, 5).foldLeft(0)(_ + _)

12. Differencies
●
Approach to Standard library
– Ruby: Big Class Principle
●
Standard libraries for daily scripting
– Scala: ?
●
Standard libraries are poor for scripting
● Community Culture
– Ruby: There exists the Ruby way
– Scala: Absence of Scala way

13. Something Learnable from Ruby
– Community Culture -
●
The Scala Way is needed
– FAQ: Is my code Scala-ish code ?
● Don't be snappy
– Ignore unfair compliant from non-Scala user
– Scala beginner sometimes fear Scala community
● Use academic word carefully

14. Something learnable from Ruby
- Standard Library -
●
Daily scripting library important
– I/O library
– Network library
– Their library should be standard
● Too general library is bad signal
– To be pragmatic
– It's fine if 95% task can be done using it

15. Conclusion
Learn something from Ruby community