Scala for C# Developers
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The document introduces Scala as a modern JVM language that aims to replace Java, emphasizing its academic roots and continual updates. It discusses core differences between Scala and C#, including syntax, typing, immutability, and pattern matching. Additionally, it highlights various tools, libraries, and resources available for learning Scala.
![Syntax Doesn’t Matter, Right?
C#
class Foo: Bar, IBaz
class Foo<TBar>
interface IFoo
int foo(string s) { return 42;
}
...
Scala
class Foo extends Bar with Baz
class Foo[TBar]
trait Foo
def foo(s: String) = 42
...](https://image.slidesharecdn.com/scalaforcdevelopers-130718025248-phpapp02/85/Scala-for-C-Developers-9-320.jpg)
![Immutable By Default
val and var
C#’s readonly
lazy val
.NET’s Lazy[T]
Collections](https://image.slidesharecdn.com/scalaforcdevelopers-130718025248-phpapp02/85/Scala-for-C-Developers-11-320.jpg)
Scala for C# Developers
- 1. Scala for C# Developers Omer van Kloeten
- 2. Hi! CTO at Eight years working in C# Two years suffering Java Two years enjoying Scala newBrandAnalytics AppMyDay
- 3. What is Scala? JVM Language Academic roots Released 2003 Maintained by TypeSafe Continuously updated
- 4. Why should I care? CLR vs. JVM The Hummus Manifesto Java is old, Scala is the new hotness Learn, learn, learn
- 6. Similar Backgrounds Trying to replace Java Benevolent Dictators Design-by-committee sucks! Strongly and statically typed Object-functional
- 7. Imperative vs. Functional Imperative C# Functional LINQ… …But In Reality
- 8. Functional First Functional C# Functional Scala Slight differences Underscores… underscores everywhere! Strict (immediate) vs. Non-Strict (lazy) people.view().filter… Lots more than we can cover here…
- 9. Syntax Doesn’t Matter, Right? C# class Foo: Bar, IBaz class Foo<TBar> interface IFoo int foo(string s) { return 42; } ... Scala class Foo extends Bar with Baz class Foo[TBar] trait Foo def foo(s: String) = 42 ...
- 10. Syntax Doesn’t Matter, Defaults Do C# Private by default Non-virtual by default Scala Public by default Virtual by default Java mentality
- 11. Immutable By Default val and var C#’s readonly lazy val .NET’s Lazy[T] Collections
- 12. Tuples and Case Classes Tuples First-class citizen Completely typed
- 13. Tuples and Case Classes Tuples First-class citizen Completely typed Case classes Easy, immutable types
- 14. Everything Is An Expression
- 18. Pattern Matching: Summary switch/case on steroids First-class language construct Statically checked for comprehensiveness
- 19. What Scala Doesn’t Have A fast compiler C#’s value types Built-ins Structs Enums Partial types and methods Getters and Setters Well, no, but… Native for or foreach support
- 20. Wait, what?! Well, kinda… ...is translated to:
- 21. Language Topics Not Covered :( Streams Type inference Tail recursion Multiple inheritance Operators Implicits Structural Type Definitions Companion objects Parallelization and concurrency Monads Macros Reflection More underscores!
- 22. Tooling and Libraries Almost twenty years of Java Scala wrappers Great community Engineers Scientists
- 23. Tooling: IDEs Scala plugin JetBrains of ReSharper fame Scala over Eclipse TypeSafe Maintainers of Scala NetBeans, Sublime, etc.
- 24. Tooling: REPL
- 25. Tooling: Build System Maven Better than Ant Bloated Written in Java for Java SBT Simple Build Tool Irony Written in Scala for Scala
- 26. Frameworks Web Frameworks Play! Framework Lift Scalatra Object-Relational Mappers Slick Squeryl Unit Testing Specs2 ScalaTest
- 27. Where Do I Start? Base stuff: Download and install latest JDK (from oracle.com) Go to http://scala-lang.org/downloads, download and install the MSI IntelliJ IDEA: Go to http://jetbrains.com/idea/download, download and install the Community Edition Demo
- 28. Where Do I Start? Twitter’s Scala School A Tour of Scala Another Tour of Scala Functional Programming Principles in Scala Scala By Example (PDF) Programming in Scala (Book)
Editor's Notes
- #4: Image CC-BY-NC-SA, Alejandro Crosa http://www.flickr.com/photos/alejandrocrosa/5247567841/New version every yearBugfixes every few months
- #6: Logos are copyright their respective owners
- #7: Anders HejlsbergMartinOdersky
- #12: String is immutable in C#
- #16: Match values, typesUnderscore syntax
- #17: Underscore syntax
- #21: While is still while
- #26: In .NET: MSBuild,NAnt, Cruise Control.NET
- #27: Play, like ASP.NET MVC – LinkedIn, KloutLift, like ASP.NET – FoursquareScalatra, like NancyFX – LinkedIn, The Guardian
- #30: Photo CC-BY, Ian Muttoo http://www.flickr.com/photos/imuttoo/2123301945/