Scala for C# Developers

Scala for C# Developers

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  Scala for C#Developers Omer van Kloeten
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  Hi!  CTO at Eight years working in C#  Two years suffering Java  Two years enjoying Scala  newBrandAnalytics  AppMyDay
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  What is Scala? JVM Language  Academic roots  Released 2003  Maintained by TypeSafe  Continuously updated
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  Why should Icare?  CLR vs. JVM  The Hummus Manifesto  Java is old, Scala is the new hotness  Learn, learn, learn
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  Who uses Scala?
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  Similar Backgrounds  Tryingto replace Java  Benevolent Dictators  Design-by-committee sucks!  Strongly and statically typed  Object-functional
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  Imperative vs. Functional ImperativeC# Functional LINQ… …But In Reality
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  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…
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  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  ...
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  Syntax Doesn’t Matter, DefaultsDo C#  Private by default  Non-virtual by default Scala  Public by default  Virtual by default  Java mentality
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  Immutable By Default val and var  C#’s readonly  lazy val  .NET’s Lazy[T]  Collections
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  Tuples and CaseClasses  Tuples  First-class citizen  Completely typed
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  Tuples and CaseClasses  Tuples  First-class citizen  Completely typed  Case classes  Easy, immutable types
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  Everything Is AnExpression
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  Pattern Matching: Basics
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  Pattern Matching: Unapply
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  Pattern Matching: Collections
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  Pattern Matching: Summary switch/case on steroids  First-class language construct  Statically checked for comprehensiveness
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  What Scala Doesn’tHave  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
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  Wait, what?! Well, kinda…...is translated to:
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  Language Topics NotCovered :(  Streams  Type inference  Tail recursion  Multiple inheritance  Operators  Implicits  Structural Type Definitions  Companion objects  Parallelization and concurrency  Monads  Macros  Reflection  More underscores!
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  Tooling and Libraries Almost twenty years of Java  Scala wrappers  Great community  Engineers  Scientists
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  Tooling: IDEs  Scalaplugin  JetBrains  of ReSharper fame  Scala over Eclipse  TypeSafe  Maintainers of Scala NetBeans, Sublime, etc.
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  Tooling: REPL
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  Tooling: Build System Maven Better than Ant  Bloated  Written in Java for Java SBT  Simple Build Tool  Irony  Written in Scala for Scala
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  Frameworks  Web Frameworks Play! Framework  Lift  Scalatra  Object-Relational Mappers  Slick  Squeryl  Unit Testing  Specs2  ScalaTest
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  Where Do IStart?  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
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  Where Do IStart?  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)
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  Thank you Questions? @omervk