13 lines
400 B
Scala
13 lines
400 B
Scala
object Caesar {
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private val alphaU='A' to 'Z'
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private val alphaL='a' to 'z'
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def encode(text:String, key:Int)=text.map{
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case c if alphaU.contains(c) => rot(alphaU, c, key)
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case c if alphaL.contains(c) => rot(alphaL, c, key)
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case c => c
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}
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def decode(text:String, key:Int)=encode(text,-key)
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private def rot(a:IndexedSeq[Char], c:Char, key:Int)=a((c-a.head+key+a.size)%a.size)
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}
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