Initial data commit

Task/Vigen-re-cipher/JavaScript/vigen-re-cipher.js

@@ -0,0 +1,24 @@
+// helpers
+// helper
+function ordA(a) {
+  return a.charCodeAt(0) - 65;
+}
+
+// vigenere
+function vigenere(text, key, decode) {
+  var i = 0, b;
+  key = key.toUpperCase().replace(/[^A-Z]/g, '');
+  return text.toUpperCase().replace(/[^A-Z]/g, '').replace(/[A-Z]/g, function(a) {
+    b = key[i++ % key.length];
+    return String.fromCharCode(((ordA(a) + (decode ? 26 - ordA(b) : ordA(b))) % 26 + 65));
+  });
+}
+
+// example
+var text = "The quick brown fox Jumped over the lazy Dog the lazy dog lazy dog dog";
+var key = 'alex';
+var enc = vigenere(text,key);
+var dec = vigenere(enc,key,true);
+
+console.log(enc);
+console.log(dec);