Add solution #263

Author: JoshCrozier

solutions/0263-ugly-number.js

@@ -13,9 +13,8 @@
  * @return {boolean}
  */
 var isUgly = function(num) {
-  if (num < 1) return false;
-  while (num % 5 === 0) num /= 5;
-  while (num % 3 === 0) num /= 3;
-  while (num % 2 === 0) num /= 2;
+  for (let i of [2, 3, 5]) {
+    while (num && num % i === 0) num /= i;
+  }
   return num === 1;
 };