A Practical Introduction To Scala

Transcript

1. A PRACTICAL INTRODUCTION TO SCALA
2. BRYAN JOSEPH @BRYANJOS
3. BACKGROUND
4. OO/FP Hybrid Programming Language that runs on the JVM Created by Martin Odersky in 2001 First Release in 2003 Created Typesafe as a Scala Training and Consultant Company There was a .NET version as well. No Longer supported
5. WHY I LIKE SCALA?
6. NOT ENTERPRISE JAVA
7. LESS VERBOSE THAN JAVA
8. Java
9. Java Part 2
10. Still Java
11. Scala
12. PATTERN MATCHING
13. CLASSES AND OBJECTS
14. COLLECTIONS
15. JAVA INTEROPERABILITY
16. SBT Simple Build Tool
17. MONADS Option Try Future Either
18. IMMUTABLE BY DEFAULT Preference is to use val for most situations Use var when needed Try to keep mutable variables in smallest scope possible Default collections are immutable but there are mutable versions
19. EASIER CONCURRENCY via Futures, Parallel Collections and Akka (http://akka.io)
20. TRAITS Very Similar to the concept of mixins in Ruby Allow for Multiple Inheritance! Can define both specification and/or implementation
21. OTHER NICE FEATURES Macros Implicits String Interpolation Value Classes Xml Inner functions
22. DOWNSIDES
23. SLOWER COMPILE TIMES THAN JAVA
24. JAVA INTEROPERABILITY
25. CAN SOMETIMES LOOK INTIMIDATING
26. TOOLS
27. SBT Simple Build Tool
28. EDITOR SUPPORT Eclipse Scala Plugin IntelliJ Scala Plugin Sublime Text Enslime
29. GITER8 Project Scaffolding ! https://github.com/n8han/giter8
30. WEB FRAMEWORKS
31. PLAY! http://www.playframework.com/
32. PLAY! MVC Framework Reactive (http://www.reactivemanifesto.org/) Built for scale Coffeescript and Less Support Templates based on ASP.NET’s Razor Engine Templates are functions too Used by LinkedIn
33. SCALATRA http://www.scalatra.org/
34. SCALATRA Inspired by Sinatra Customize controllers using Traits Can use a variety of template engines thanks in part to Scalate (Jade, Mustache, Scaml, SSP, Scuery)
35. SKINNY https://github.com/seratch/skinny-framework
36. SKINNY Goal is to be Scala on Rails Built on top of Scalatra
37. LIFT http://liftweb.net/
38. LIFT One of the earlier Scala Web frameworks Probably nothing like what you have used before Write normal html. Add class names to specify you want server processing Page loads before processing is done Focused on speed, security, and ease of working with designers Used By Foursquare
39. UNFILTERED http://unfiltered.databinder.net/Unfiltered.html
40. UNFILTERED Toolkit for servicing HTTP requests Can handle requests on various server backends
41. WHO’S USING IT?
43. DATABASE LIBRARIES
44. RELATIONAL JDBC Slick Sorm Scala-ActiveRecord Activate Async-Postgresql Async-MySql ScalalikeJDBC
45. NOSQL Casbah Reative Mongo Riak-Scala-Client Rethink-Scala Cassie
46. NOTE TO SELF, MENTION THESE Finagle Finatra Subcut PredictionIO Scalaz
47. RESOURCES Scala For The Impatient (http://www.amazon.com/Scala-Impatient-Cay-S-Horstmann/dp/0321774094) Twitter’s Scala School (http://twitter.github.io/scala_school/) Akka (http://akka.io) giter8 (https://github.com/n8han/giter8) Play! (http://www.playframework.com/) Scalate (http://scalate.fusesource.org/) Scalatra (http://www.scalatra.org/) Lift (http://liftweb.net/) Unfiltered (http://unfiltered.databinder.net/Unfiltered.html) Reactive Manifesto (http://www.reactivemanifesto.org/)
48. QUESTIONS?