Issue HowProgrammingWorks#2: Task two.

Author: Dmitry Porokhnya

Exercises/2-by-value.js

@@ -1,5 +1,9 @@
 'use strict';
 
-const inc = null;
+const inc = num => ++num;
+
+const a = 5;
+const b = inc(a);
+console.dir({ a, b });
 
 module.exports = { inc };