diff --git a/script.js b/script.js
index d4c302e..d5ad056 100644
--- a/script.js
+++ b/script.js
@@ -1,3 +1,24 @@
+var $jscomp = $jscomp || {};
+$jscomp.scope = {};
+$jscomp.arrayIteratorImpl = function(a) {
+  var b = 0;
+  return function() {
+    return b < a.length ? {done:!1, value:a[b++]} : {done:!0};
+  };
+};
+$jscomp.arrayIterator = function(a) {
+  return {next:$jscomp.arrayIteratorImpl(a)};
+};
+$jscomp.makeIterator = function(a) {
+  var b = "undefined" != typeof Symbol && Symbol.iterator && a[Symbol.iterator];
+  if (b) {
+    return b.call(a);
+  }
+  if ("number" == typeof a.length) {
+    return $jscomp.arrayIterator(a);
+  }
+  throw Error(String(a) + " is not an iterable or ArrayLike");
+};
 function restrictInput(a) {
   a.value = a.value.replace(/[^0-9]/g, "").slice(0, 16);
 }
@@ -6,27 +27,14 @@ function validateCreditCard(a) {
   var b = getCardNetwork(a);
   return b && a.length == b.length && luhnCheck(a) ? !0 : !1;
 }
-
 function getCardNetwork(a) {
-  const cardNetworks = [
-    { pattern: /^\b4\d{15}\b/, name: "Visa", length: 16 },
-    { pattern: /^\b5[1-5]\d{14}\b/, name: "MasterCard", length: 16 },
-    { pattern: /^\b3[47]\d{13}\b/, name: "American Express", length: 15 },
-    { pattern: /^\b30[0-5]\d{11}\b/, name: "Diners Club", length: 14 },
-    { pattern: /^\b35[3-8]\d{13}\b/, name: "JCB", length: 16 },
-    { pattern: /^\b5[0678]\d{14,17}\b/, name: "Maestro", length: 16 },
-    { pattern: /^\b6011\d{12}\b/, name: "Discover", length: 16 }
-  ];
-
-  for (const network of cardNetworks) {
-    if (network.pattern.test(a)) {
-      return { name: network.name, length: network.length };
+  for (var b = $jscomp.makeIterator([{pattern:/^\b4\d{15}\b/, name:"Visa", length:16}, {pattern:/^\b5[1-5]\d{14}\b/, name:"MasterCard", length:16}, {pattern:/^\b3[47]\d{13}\b/, name:"American Express", length:15}, {pattern:/^\b30[0-5]\d{11}\b/, name:"Diners Club", length:14}, {pattern:/^\b35[3-8]\d{13}\b/, name:"JCB", length:16}, {pattern:/^\b5[0678]\d{14,17}\b/, name:"Maestro", length:16}, {pattern:/^\b6011\d{12}\b/, name:"Discover", length:16}]), c = b.next(); !c.done; c = b.next()) {
+    if (c = c.value, c.pattern.test(a)) {
+      return {name:c.name, length:c.length};
     }
   }
-
   return null;
 }
-
 function luhnCheck(a) {
   for (var b = 0, c = !1, e = a.length - 1; 0 <= e; e--) {
     var d = parseInt(a.charAt(e));
@@ -36,7 +44,6 @@ function luhnCheck(a) {
   }
   return 0 === b % 10;
 }
-
 function checkCC() {
   event.preventDefault();
   var a = document.querySelector("#cc"), b = document.querySelector("#result"), c = getCardNetwork(a.value);