ROT 13 implementation

nzwnabdulwahid · abranhe · commit 481ad62b518b · 2018-10-02T18:34:59.000-04:00
diff --git a/ciphers/rot13.js b/ciphers/rot13.js
@@ -0,0 +1,18 @@
+// JavaScript implementation of ROT13
+//
+// Author: NIEZWAN ABDUL WAHID
+
+function rot13(str) {
+  var string = [];
+
+  for (var i = 0; i < str.length; i++) {
+     if ((str.charCodeAt(i) > 77 && str.charCodeAt(i) <= 90) || (str.charCodeAt(i) > 109 && str.charCodeAt(i) <= 122)) {
+      string.push(String.fromCharCode(str.charCodeAt(i) - 13));
+    } else {
+      string.push(String.fromCharCode(str.charCodeAt(i) + 13));
+    }
+  }
+  return string.join("");
+}
+
+// rot13("hello") == "uryyb"
