Substitution cipher: Difference between revisions

=={{header|Scala}}==

<lang Scala>object SubstitutionCipher extends App {

private val key = "]kYV}(!7P$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N" + "[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ"

private val text =

""""It was still dark, in the early morning hours of the twenty-second of December

| 1946, on the second floor of the house at Schilderskade 66 in our town,

| when the hero of this story, Frits van Egters, awoke."""".stripMargin

val enc = encode(text)

println("Encoded: " + enc)

println("Decoded: " + decode(enc))

private def encode(s: String) = {

val sb = new StringBuilder(s.length)

s.map {

case c if (' ' to '~').contains(c) => sb.append(key(c.toInt - 32))

case _ =>

}

sb.toString

}

private def decode(s: String) = {

val sb = new StringBuilder(s.length)

s.map {

case c if (' ' to '~').contains(c) =>

sb.append((key.indexOf(c.toInt) + 32).toChar)

case _ =>

}

sb.toString

}

}</lang>

{{Out}}See it running in your browser by [https://scalafiddle.io/sf/f9yNWk7/0 ScalaFiddle (JavaScript, non JVM)] or by [https://scastie.scala-lang.org/8CyCsxnnRZyn0JH0yegndA Scastie (JVM)].

<pre>Original: The quick brown fox jumps over the lazy dog, who barks VERY loudly!

-> Decoded: The quick brown fox jumps over the lazy dog, who barks VERY loudly!</pre>