asyn-series-example.js

async.series([
  function(callback) {
    console.log('one');
    callback(null, 1);
  },
  function(callback) {
    console.log('two');
    callback(null, 2);
  },
  function(callback) {
    console.log('three');
    callback(null, 3);
  }
],
function(err, results) {
  console.log(result);
  // results is now equal to [1, 2, 3]
});

async.series({
  1: function(callback) {
    setTimeout(function() {
      console.log('Task 1');
      callback(null, 'one');
    }, 200);
  },
  2: function(callback) {
    setTimeout(function() {
      console.log('Task 2');
      callback(null, 'two');
    }, 300);
  },
  3: function(callback) {
    setTimeout(function() {
      console.log('Task 3');
      callback(null, 'three');
    }, 100);
  }
},
function(err, results) {
  console.log(results);
  // results is now equal to: { 1: 'one', 2: 'two', 3:'three' }
});