Understanding nodejs nextTick

Understanding nodejs nextTick

var sys = require('sys');

var print = function print(list) {
  for (var i = 0; i < list.length; i++) {
    var item = list[i];           
    if (item.length) {
      print(item);
    }       
    else {
      sys.puts(item);
    }
  }
};                               

var printTick = function printTick(list, nextTick) {
  var i = 0;            
  
  (function printNextItem() {
    var item = list[i++];
    if (item) {
      if (item.length) {                    
        printTick(item, printNextItem);
      }       
      else {
        sys.puts(item);              
        process.nextTick(printNextItem);   
                 
        if (list.length === i && nextTick) {
          process.nextTick(nextTick);
        }
      }
    }  
  })();                          
};

var l = [1, [2, [3, [4, 5], 6], 7], 8, 9, [10, 11]];
print(l);
sys.puts('--');
printTick(l);