tracks/ecmascript/exercises/simple-cipher/example.js in trackler-2.2.0.0 vs tracks/ecmascript/exercises/simple-cipher/example.js in trackler-2.2.0.1

@@ -1,9 +1,9 @@
 const ALPHA = 'abcdefghijklmnopqrstuvwxyz';
 
 function generateKey() {
-  return Array.apply(null, Array(100))
+  return Array(...Array(100))
     .map(() => ALPHA[Math.floor(Math.random() * ALPHA.length)])
     .join('');
 }
 
 function xCode(key, inText, sign) {
@@ -16,22 +16,21 @@
 }
 
 const mod = (n, m) => (n % m + m) % m;
 
 export default function (key) {
-
   if (typeof key === 'undefined') {
     key = generateKey();
-  } else if (key.length === 0 || key.match(/[^a-z]/, "g")) {
-    throw new Error("Bad key");
+  } else if (key.length === 0 || key.match(/[^a-z]/, 'g')) {
+    throw new Error('Bad key');
   }
 
   return {
-    key:    key,
-    encode: function (plainText) {
+    key,
+    encode(plainText) {
       return xCode(this.key, plainText, 1);
     },
-    decode: function (encodedText) {
+    decode(encodedText) {
       return xCode(this.key, encodedText, -1);
-    }
-  }
+    },
+  };
 }