Пример для не enumerable полей (for...in arr) (#12)

* Example of non-enumerable fields

Author: Vlad Esin

JavaScript/5-for-in-array.js

@@ -5,6 +5,10 @@ numbers.field2 = 'Value2';
 numbers[-10] = 'Value3';
 numbers.field1 = 'Value1';
 numbers[5] = 20;
+Object.defineProperty(numbers, 'newField', {
+  enumerable: false,
+  value: 'valueOfNewField',
+});
 
 for (const i in numbers) {
   const value = numbers[i];