fix: Error Object doesn't support this property or method fixes #147

src/bowser.js

@@ -435,7 +435,7 @@
       return Array.prototype.map.call(arr, iterator);
     }
     for (i = 0; i < arr.length; i++) {
-      result = iterator(arr[i]);
+      result.push(iterator(arr[i]));
     }
     return result;
   }