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def lessThan(max: Int, value: Int) = value < max | |
//> lessThan: (max: Int, value: Int)Boolean | |
lessThan(5, 10) | |
//> res0: Boolean = false | |
// Partial applied functions | |
val lessThan5 = lessThan(max = 5, _: Int) | |
//> lessThan5 : Int => Boolean = <function1> | |
lessThan5(10) | |
//> res1: Boolean = false |
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val players = List("Timo", "Jan", "Lothar", "Sven", "Danny") | |
//> players : List[String] = List(Timo, Jan, Lothar, Sven, Danny) | |
val playerPairs = for { | |
p1 <- players | |
p2 <- players | |
if p1 != p2 | |
} yield (p1, p2) | |
//> playerPairs : List[(String, String)] = List((Timo,Jan), (Timo,Lothar), (Tim | |
//| o,Sven), (Timo,Danny), (Jan,Timo), (Jan,Lothar), (Jan,Sven), (Jan,Danny), (L |
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http://http://www.scala-lang.org/ - Scala Homepage | |
http://typesafe.com/platform/getstarted - Typesafe Activator | |
http://twitter.github.io/scala_schoo/l - Twitter Scala School | |
https://www.coursera.org/course/progfun - Coursera Scala Kurs |
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// Class preconditions | |
case class ScoreCond(p1: Int, p2: Int) { | |
require(p1 != p2) | |
require(p1 > 0 && p2 > 0) | |
} | |
ScoreCond(1, 2) | |
// Unerlaubte Werte führen zu einer Illegal argument exception | |
//ScoreCond(5, 5) |
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// object orientation | |
trait Player | |
case class EmptyPlayer() extends Player | |
case class NamedPlayer(name: String) extends Player | |
case class Score(p1: Int, p2: Int) | |
// Vorteil case class: toString, hashcode, copy, == vs. eq | |
val scoreA = Score(1, 2) | |
scoreA.toString() | |
scoreA.hashCode() |
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// List (immutable) | |
val numbers: List[Int] = List(1, 2, 6, 34, 17, 42, 54, 100, 117, 1337) | |
// Map (immutable) | |
val map = Map("Test" -> 4, "ABC" -> 4) | |
// List API | |
// Filter | |
numbers.filter(x => x < 4) | |
numbers.filter(_ < 4) |