Adding CaesarCipher

Author: mamenesia

caesarCipher.js

@@ -0,0 +1,29 @@
+function caesarCipher(str, num) {
+  num = num % 26;
+  var lowerCaseString = str.toLowerCase();
+  var alphabet = 'abcdefghijklmnopqrstuvwxyz'.split('');
+  var newString = '';
+
+  for(var i = 0; i < lowerCaseString.length; i++){
+    let currentLetter = lowerCaseString[i];
+    if(currentLetter === ' ') {
+      newString += currentLetter;
+      continue;
+    }
+    let currentIndex = alphabet.indexOf(currentLetter);
+    let newIndex = currentIndex + num;
+    if(newIndex > 25) newIndex = newIndex - 26;
+    else if(newIndex < 0) newIndex = 26 + newIndex;
+    else newIndex = newIndex;
+
+    if(str[i] === str[i].toUpperCase()){
+      newString += alphabet[newIndex].toUpperCase();
+    } else newString += alphabet[newIndex];
+  }
+
+  console.log(newString);
+  return newString;
+}
+
+
+caesarCipher('Javascript', -900);