独書会 Scala IN DEPTH @ファミレス その1 ref: http://qiita.com/asmasa/items/f8f09655543cf171aaf3

file2.txt

x.foo();  /*is the same as*/ x foo
x.foo(y); /*is the same as*/ x foo y
x.::(y);  /*is the same as*/ y :: x

リファクタリング前

def qsort[T <% Ordered[T]](list:List[T]):List[T] = {
  list.match({
    case Nil => Nil;
    case x::xs =>
       val (before,after) = xs.partition({ i => i.<(x) });
       qsort(before).++(qsort(after).::(x)));
  });
}

リファクタリング後

def qsort[T <% Ordered[T]](list:List[T]):List[T] = list match {
    case Nil => Nil
    case x :: xs =>
       val (before, after) = xs partition ( _ < x )
       qsort(before) ++ (x :: qsort(after));
}