Final javascript projects

Author: Yasholo

JavaScript-Algorithms-and-Data-Structures-Projects/Caesars-Cipher.js

@@ -0,0 +1,23 @@
+function rot13(str) {
+  str = str.toUpperCase();
+  var newStr = "";
+  for (let i=0; i < str.length; i++){
+    if (str.charCodeAt(i) >= 65 && str.charCodeAt(i) <= 90){
+      //console.log(str.charCodeAt(i));
+      var newCode = str.charCodeAt(i)+13;
+      if (newCode > 90){
+        newCode = newCode - 90 + 64;
+      }
+      //console.log(newCode)
+      var newLetter = String.fromCharCode(newCode);
+      //console.log(str.charAt(i))  
+      newStr+=newLetter;
+    }
+    else  newStr+=str.charAt(i);
+  }
+
+  return newStr
+
+}
+
+rot13("SERR PBQR PNZC");

JavaScript-Algorithms-and-Data-Structures-Projects/Palindrome-Checker.js

@@ -0,0 +1,15 @@
+function palindrome(str) {
+  var regexPattern = /[^A-Za-z0-9+]/g;
+  var newStr = (str.replace(regexPattern, "")).toLowerCase();
+  var palStr = newStr.split("").reverse().join("");
+  if (newStr == palStr)
+    return true;
+  else return false;
+}
+
+palindrome('eye');
+
+/*** 
+let str = prompt("Please enter a string: ");
+palindrome(str);
+***/

JavaScript-Algorithms-and-Data-Structures-Projects/Roman-Numeral-Converter.js

@@ -0,0 +1,60 @@
+function convertToRoman(num) {
+  var romanNum = "";
+  while(num>0){
+    if (num >=1000){
+      romanNum+="M";
+      num-=1000;
+    }
+    else if (num >= 900){
+      romanNum+="CM";
+      num-=900;
+    }
+    else if (num >= 500){
+      romanNum+="D";
+      num-=500;
+    }
+    else if (num >= 400){
+      romanNum+="CD";
+      num-=400;
+    }
+    else if (num >= 100){
+      romanNum+="C";
+      num-=100;
+    }
+    else if (num >= 90){
+      romanNum+="XC";
+      num-=90;
+    }
+    else if (num >= 50){
+      romanNum+="L";
+      num-=50;
+    }
+    else if (num >= 40){
+      romanNum+="XL";
+      num-=40;
+    }
+    else if (num >= 10){
+      romanNum+="X";
+      num-=10;
+    }
+    else if (num >= 9){
+      romanNum+="IX";
+      num-=9;
+    }
+    else if (num >= 5){
+      romanNum+="V";
+      num-=5;
+    }
+    else if (num >= 4){
+      romanNum+="IV";
+      num-=4;
+    }
+    else {
+      romanNum+="I";
+      num-=1;
+    }
+  }
+ return romanNum;
+}
+
+convertToRoman(36);