Vigenère cipher: Difference between revisions

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@@ Line 1,947: / Line 1,947: @@
 <lang nim>import strutils
+proc encrypt(msg, key: string): string =
-proc isAlpha(c): bool = c in 'a'..'z' or c in 'A'..'Z'
-proc encrypt(msg, key): string =
-  result = ""
   var pos = 0
   for c in msg:
-    if isAlpha c:
+    if c in Letters:
-      result.add chr(((ord(key[pos]) + ord(toUpper c)) mod 26) + ord('A'))
+      result.add chr(((ord(key[pos]) + ord(c.toUpperAscii)) mod 26) + ord('A'))
       pos = (pos + 1) mod key.len
-proc decrypt(msg, key): string =
+proc decrypt(msg, key: string): string =
-  result = ""
   var pos = 0
   for c in msg:
@@ Line 1,973: / Line 1,969: @@
 echo encr
 echo decr</lang>
 {{out}}
 <pre>Beware the Jabberwock, my son! The jaws that bite, the claws that catch!