queue-async sample

gistfile1.txt

var queue = require('queue-async');
var q = queue(1); // one concurrent task

// Queue 2 task and define completion call back
q.defer(setTimeout, function(callback) { console.log('job 1'); callback(null);}, 1000)
  .defer(setTimeout, function(callback) { console.log('job 2'); callback(null); }, 1000)
  .awaitAll(function(error, results) { console.log('all done!'); } ); 

// Queue 2 more tasks before completion kicks in
q.defer(setTimeout, function(callback) { console.log('job 3'); callback(null);}, 1000); 
q.defer(setTimeout, function(callback) { console.log('job 4'); callback(null);}, 1000);

// Add a task with a param
q.defer(setTimeout, function(param, callback) { console.log(param + ' job 3'); callback(null); }, 1000, 'Now running:');