Yop

try.scala

// prime number generator
for (i <- 2 to 1000)
  if((2 to i).find( j=> (i % j == 0 && i != j) ) == None)
    println(i)

// function currying example

def matcher(haystack: List[Char])(needle: String) = {                                                                     
      haystack contains needle.charAt(0)                                                                                       
     }  

def isInitialUpperCase = matcher(List('A','B','C','D','E','F','G','H','I','L','M','N','O','P','Q','R','S','T','U','V','Z')) _
isInitialUpperCase("Fe")

val upperCased = {                
      if (isInitialUpperCase("fe")) "fe"
      else "Fe"                        
     }

List("Federico","federico","Andrea").filter(isInitialUpperCase)

// immutability

val x = 2
var mutableX = 3
mutableX = 4; // yes

val m = Map("1" -> "one")
m("1") = "ONE"; // it does work, but it's not assigning, it's returning a new Map