This document provides a summary of a sightseeing tour that discusses the Scala programming language. It compares Scala to other languages like Java, C++, and C#, highlights Scala's features like functional programming, concurrency, pattern matching and traits. It also discusses who uses Scala and how popular it is. The document concludes by providing some resources for learning more about Scala.

1. A sightseeing tour
Iulian Dogariu
Ness Technologies
Iași JUG – 13 February 2013

3. I’m sure I’ve been here before

4. That’s it! Goodbye
And thank you for riding with Scala Tours

5. Who are You?

6. “If someone had shown me the
Programming in Scala book in 2003, I
would not have created Groovy”
-- James Strachan, creator of Groovy

8. C:
“ASM is not portable”

9. C++:
“C is nice,
but OOP is the future”

10. Java:
“C++ is nice,
but it’s too dangerous”

11. C#:
“Java is nice”
“And we’re so jealous!”

12. Scala?
“Java is nice”
“And we’re so jealous”
“… of Haskell”
“… and Erlang”
“… and Python”

13. Functional style
Express processes, not just things
def listCapitalisedWords(text:String) =
text.split("s").
filterNot(_.isEmpty).
filter(_.charAt(0).isUpper)

14. Massive concurrency
Message passing
No shared state
Ready for the “multicore era”

15. But also
Less code => Less room for bugs to hide in (!)
More expressive constraints in the types
Full Java interoperability

16. Options, options everywhere

17. “We can do this in Java too”
It’s not what is possible, it’s what is easy

18. Pattern matching

19. Got Change?
val vs var

20. Traits

21. λ

22. What’s the use?
Language is a medium of expression, not just a tool

23. Data structures
Choose the right one, and the algorithms take care of themselves
val weekdays = List(“Monday”, “Tuesday”,
“Wednesday”, “Thursday”,
“Friday”)
val beatles = Set(“Ringo”, “John”,
“Paul”, “George”)
val aTuple = (1, “John Smith”, false)
val dataset = Array( (1, “Ion Popescu”),
(3, “Maria Teodorescu”) )

24. Actors

25. Who uses Scala?
Source: slideshare.net/mslinn/scala-adoption-by-enterprises

26. How popular?
…
Source: TIOBE index February 2013

27. … hmm.
Source: TIOBE index February 2013

28. Tooling

29. Pitfalls
and oddities

30. One more thing

31. specs2

33. […] You can write large programs in
JavaScript. You just can’t maintain
them.
-- Anders Hejlsberg

34. Use your head
“Lacking opinions, all code reflects the coder”

35. Resources
• http://www.scala-lang.org
• Book: Martin Odersky – Programming in Scala
• Book: Venkat Subramaniam – Programming Scala
• Commercial support: Typesafe, Inc.
http://www.typesafe.com

36. Thank you!