A Glimpse of a Scala - Java Meetup Novi Sad May 2014

I gave an introduction to Scala at Novi Sad on 29.05.2014. The corresponding code examples can be found here: https://github.com/lukaspustina/A-Glimpse-Of-Scala-Java-Meet-Up-in-Novi-Sad

Transcript

1. A Glimpse of Scala Dr. Lukas Pustina @drivebytesting codecentric AG
2. Which Programming Language would you use now on top of JVM? Scala! James Gosling, Father of Java
3. Scala is fun and designed for the future.
4. @drivebytesting
5. What to expect
6. Syntax vs. Idioms How to use a language.
7. Before we start
8. Open your mind
9. Let’s program our minds The brain has bugs
10. Exposure Effect We prefer things we know and are familiar with
12. “Gott würfelt nicht!” “God doesn’t role the dice!” — Albert Einstein
13. Bundesarchiv, Bild183-R57262 / CC-BY-SA
14. Today’s Challenges
15. CPU Memory
16. !Von Neumann Bottleneck
17. Can Programming Be Liberated from the von Neumann Style A Functional Style and Its Algebra of Programs — John Backus, 1977
18. CPU Memory Cache
19. CPU Memory Cache Cache
20. CPU Memory Cache Cache Core Core Core Core
21. CPU Memory Cache Cache Core Core Core Core
22. !False Sharing
23. Cache Cache Cache Core Core
24. Cache Cache Cache Core Core
25. Cache Cache Cache Core Core
26. !I/O Waits
27. This is the future Massive parallel computing
28. ?Threads The software engineers’ answer
29. A Universal Modular Actor Formalism for Artificial Intelligence Carl Hewitt, Peter Bishop, Richard Steiger 1973
30. Reactive Programming Immutability, Functional, Actors are one approach.
31. A Glimpse of Scala
32. SCAlable LAnguage A multi-paradigm language
33. Return of Computer Science Bear with me :)
34. Object oriented, functional language Multi-paradigm language
35. OO and func • State Mutation vs. Immutability • Object Composition vs. Functional Composition • Class Hierarchies vs. Pattern Matching
36. Type Inference The type of variables and functions is interfered from assignments and return values.
37. Immutability Immutability right in the language: val and immutable collections.
38. Functions as 1st class citizens Pass a function as you would pass an Int, a String, or an arbitrary object.
39. Hello World The first program in the REPL
40. [lukas@muffin] ~ ➜ scala! Welcome to Scala version 2.11.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_51).! Type in expressions to have them evaluated.! Type :help for more information.! ! scala> print("Hello World")! Hello World
41. A Closer Look
42. With great power … … comes great responsibility.
43. @drivebytesting
44. End Dr. Lukas Pustina @drivebytesting codecentric AG