@@ -0,0 +1,14 @@
+const KEYS = ["","C","CC","CCC","CD","D","DC","DCC","DCCC","CM",
+               "","X","XX","XXX","XL","L","LX","LXX","LXXX","XC",
+               "","I","II","III","IV","V","VI","VII","VIII","IX"];
+
+const IntegerToToman = num => {
+  if (isNaN(num)) return `value "${num}" is not a number`;
+  if(!Number.isInteger(num)) return `value "${num}" is not an integer`;
+  const digits = String(+num).split("")
+  let roman = "";
+
+  for(let i = 2; i >= 0; i--) roman = (KEYS[+digits.pop() + (i * 10)] || "") + roman;
+
+  return Array(+digits.join("") + 1).join("M") + roman;
+}