Looking for something to do the following:
Given input: "s"
Expected output: "t"
scala> def f(s: String) = (s.head + 1).toChar.toString
f: (s: String)java.lang.String
scala> f("s")
res10: java.lang.String = t
def nextLetter(x:String) = (x(0) + 1).toChar.toString
这些方法只给信件带来有意义的结果:
def nextLetter(letter: Char): Option[Char] = {
val validChars = ( a to y ) ++ ( A to Y )
if (validChars contains letter) Some((letter + 1).toChar) else None
}
def nextLetter(letter: String): Option[String] = {
if (letter.length != 1) None
else nextLetter(letter(0)).map(_.toString)
}
println(nextLetter( a ))
println(nextLetter( b ))
println(nextLetter( z ))
println(nextLetter( 1 ))
println(nextLetter( A ))
println(nextLetter("A"))
println(nextLetter("AB"))
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