scala for c# developers
DESCRIPTION
From the Scalapeño 2013 conference: http://scalapeno.underscore.co.il/ It’s no secret that in Israel, C# is one of the leading languages for development. This stems from various reasons, ranging from the power of the language to the ubiquity of Microsoft’s technologies in government and defense organizations. When it first came out, C# was Microsoft’s answer to Java and the two were on-par. Since then, C# has grown leaps and bounds and Java, while still sitting on top of the powerful JVM with a huge, open ecosystem created over nearly two decades, was left behind. Developers looking to stop paying the Microsoft-tax were faced with a language that simply did not meet their expectations. Scala is the one of the answers to this growing need for a new, modern language for the JVM. This lecture introduces the language, comparing its idioms to those of C#, and introduces you some of the tools and frameworks to get you started with it.TRANSCRIPT
Scala for C# DevelopersOmer van Kloeten
Hi!
CTO at
Eight years working in C#
Two years suffering Java
Two years enjoying Scala newBrandAnalytics AppMyDay
What is Scala?
JVM Language
Academic roots
Released 2003
Maintained by TypeSafe
Continuously updated
Why should I care?
CLR vs. JVM
The Hummus Manifesto
Java is old, Scala is the new hotness
Learn, learn, learn
Who uses Scala?
Similar Backgrounds
Trying to replace Java
Benevolent Dictators Design-by-committee sucks!
Strongly and statically typed
Object-functional
Imperative vs. Functional
Imperative C# Functional LINQ…
…But In Reality
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…
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
...
Syntax Doesn’t Matter, Defaults Do
C#
Private by default
Non-virtual by default
Scala
Public by default
Virtual by default
Java mentality
Immutable By Default
val and var C#’s readonly
lazy val .NET’s Lazy[T]
Collections
Tuples and Case Classes
Tuples First-class citizen Completely typed
Tuples and Case Classes
Tuples First-class citizen Completely typed
Case classes Easy, immutable types
Everything Is An Expression
Pattern Matching: Basics
Pattern Matching: Unapply
Pattern Matching: Collections
Pattern Matching: Summary
switch/case on steroids
First-class language construct
Statically checked for comprehensiveness
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
Wait, what?!
Well, kinda… ...is translated to:
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!
Tooling and Libraries
Almost twenty years of Java Scala wrappers
Great community Engineers Scientists
Tooling: IDEs
Scala plugin
JetBrains of ReSharper fame
Scala over Eclipse
TypeSafe Maintainers of Scala
NetBeans, Sublime, etc.
Tooling: REPL
Tooling: Build System
Maven
Better than Ant
Bloated
Written in Java for Java
SBT
Simple Build Tool
Irony
Written in Scala for Scala
Frameworks
Web Frameworks Play! Framework Lift Scalatra
Object-Relational Mappers Slick Squeryl
Unit Testing Specs2 ScalaTest
AND
EVERYTHING
FROM JAVA!
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
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)
Thank youQuestions?@omervk