Scala
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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.
![[…] You can write large programs in
JavaScript. You just can’t maintain
them.
-- Anders Hejlsberg](https://image.slidesharecdn.com/scala-130217072330-phpapp02/85/Scala-33-320.jpg)
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
- 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
- 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!