A-M baby

Task/Caesar-cipher/Groovy/caesar-cipher.groovy

@@ -0,0 +1,24 @@
+def caeserEncode(int ​cipherKey, String text) {
+    def builder = new StringBuilder()
+    text.each { character ->
+        int ch = character[0] as char
+        switch(ch) {
+            case 'a'..'z': ch = ((ch - 97 + cipherKey) % 26 + 97); break
+            case 'A'..'Z': ch = ((ch - 65 + cipherKey) % 26 + 65); break
+        }
+        builder.append(ch as char)
+    }
+    builder.toString()
+}
+def caeserDecode(int cipherKey, String text) { caeserEncode(26 - cipherKey, text) }
+
+def plainText = "The Quick Brown Fox jumped over the lazy dog"
+def cipherKey = 12
+def cipherText = caeserEncode(cipherKey, plainText)
+def decodedText = caeserDecode(cipherKey, cipherText)
+
+println "plainText: $plainText"
+println "cypherText($cipherKey): $cipherText"
+println "decodedText($cipherKey): $decodedText"
+
+assert  plainText == decodedText​​