A good old fold and I use the Next type to know which side to capitalize next.
Next
sealed trait Next case object Left extends Next case object Right extends Next def capitalize (str: String): (String, String) = { val (l, r, _) = str.foldLeft(("", "", Left: Next)) { case ((l, r, n), c) => n match { case Left => (l :+ c.toUpper, r :+ c.toLower, Right) case Right => (l :+ c.toLower, r :+ c.toUpper, Left) } } (l, r) } println(capitalize("abcdef")) // ("AbCdEf", "aBcDeF")
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Scala
A good old fold and I use the
Next
type to know which side to capitalize next.