sequence(tasks [, callback ]);

var cache = {};
sequence(
  [
    function(next){
      setTimeout(function() {
        console.log("Task A completed");
        cache.taskA = "from Task A";
        next();
      }, 1000);
    },
    function(next){
      setTimeout(function() {
        console.log("Task B: " + cache.taskA);
        console.log("Task B completed");
        next();
      }, 1000);
    }
  ], 
  function () {
    console.log('Sequence completed'); 
  }
);

var cache = {};
var taskA = function(next) {
  setTimeout(function() {
    console.log("Task A completed");
    cache.taskA = "from Task A";
    next();
  }, 1000);
};

var taskB = function(next) {
  setTimeout(function() {
    console.log("Task B: " + cache.taskA);
    console.log("Task B completed");
    next();
  }, 1000);
};

var callback = function() {
  console.log("Sequence completed in " + timer('stop') + " msec");
};

sequence( [ taskA, taskA, taskA, taskA, taskB ], callback );