Just another update

Task/Caesar-cipher/Groovy/caesar-cipher-1.groovy

@@ -0,0 +1,13 @@
+def caesarEncode(​cipherKey, 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 << (ch as char)
+    }
+    builder as String
+}
+def caesarDecode(cipherKey, text) { caesarEncode(26 - cipherKey, text) }

Task/Caesar-cipher/Groovy/caesar-cipher-2.groovy

@@ -0,0 +1,7 @@
+def caesarEncode(cipherKey, text) {
+    text.chars.collect { c ->
+        int off = c.isUpperCase() ? 'A' : 'a'
+        c.isLetter() ? (((c as int) - off + cipherKey) % 26 + off) as char : c
+    }.join()
+}
+def caesarDecode(cipherKey, text) { caesarEncode(26 - cipherKey, text) }

Task/Caesar-cipher/Groovy/caesar-cipher-3.groovy

@@ -0,0 +1,4 @@
+def caesarEncode(k, text) {
+    (text as int[]).collect { it==' ' ? ' ' : (((it & 0x1f) + k - 1) % 26 + 1 | it & 0xe0) as char }.join()
+}
+def caesarDecode(k, text) { caesarEncode(26 - k, text) }

Task/Caesar-cipher/Groovy/caesar-cipher-4.groovy

@@ -0,0 +1,4 @@
+def caesarEncode(k, text) {
+    text.tr('a-zA-Z', ((('a'..'z')*2)[k..(k+25)] + (('A'..'Z')*2)[k..(k+25)]).join())
+}
+def caesarDecode(cipherKey, text) { caesarEncode(26 - cipherKey, text) }

Task/Caesar-cipher/Groovy/caesar-cipher-5.groovy

@@ -0,0 +1,5 @@
+def caesarEncode(k, text) {
+    def c = { (it*2)[k..(k+25)].join() }
+    text.tr('a-zA-Z', c('a'..'z') + c('A'..'Z'))
+}
+def caesarDecode(cipherKey, text) { caesarEncode(26 - cipherKey, text) }

Task/Caesar-cipher/Groovy/caesar-cipher-6.groovy

@@ -0,0 +1,10 @@
+def plainText = "The Quick Brown Fox jumped over the lazy dog"
+def cipherKey = 12
+def cipherText = caesarEncode(cipherKey, plainText)
+def decodedText = caesarDecode(cipherKey, cipherText)
+
+println "plainText: $plainText"
+println "cypherText($cipherKey): $cipherText"
+println "decodedText($cipherKey): $decodedText"
+
+assert  plainText == decodedText

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

@@ -1,24 +0,0 @@
-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​​