Common mistakes made in scala coding

Common mistakes.scala

	val a = 1 //> a  : Int = 1
	val b = 2 //> b  : Int = 2

  // Common mistakes with pattern matching
  // the lower case variable pattern needs backwards quotes to work.
  
	def oneOrTwo(i: Int): String = i match {
		case `a` => "One!"
		case `b` => "Two!"
	} //> oneOrTwo: (i: Int)String

	oneOrTwo(2) //> res0: String = Two!

	// Common mistakes with type inference - folds return type inferred from default or starting type
  // The list.empty needs to specifically type [A]
	def reverse[A](list: List[A]): List[A] = {
		list.foldLeft(List.empty[A]) {
			(acc, elem) => elem :: acc
		}
	} //> reverse: [A](list: List[A])List[A]

	def myreverse[A] = (_: List[A])./:(List.empty[A])(_.::(_))
	
	reverse(List(1, 2, 3)) //> res1: List[Int] = List(3, 2, 1)

}