#!/usr/bin/node

    function main() {
      var a = 1;
      console.log(a);
    
      // named closure
      function foo() {
        a = a + 1;
      }
    
      foo();
      console.log(a);
    
      // anonymous closure
      (function() {
        a = a + 1;
      })();
    
      console.log(a);
    }
    main();