example of using async library to fetch 3 datasets, the third being dependent on the first two

async-example-for-jp

var async = require('async')

async.parallel(
  {
    // one way of doing it
    getPeople: harvest.getPeople,

    // another way of doing it
    getProjects: function(parallelCallback) {
      harvest.getProjects(parallelCallback)
    },

    // a third way of doing it
    getCake: function(parallelCallback) {
      harvest.getCake(function(msg, data) {
        parallelCallback(null, {msg: msg, data: data})
      })
    }
  },
  function(err, results) {
    if (err) {
      // ...
    }

    getHoursUsing(results.getPeople, results.getProjects, doneGettingHours)
  }
)

function doneGettingHours(err, allHours) {
  // ... 
}