Q Promise Chain that deals with sync and async functions.

gistfile1.js

var q = require('q');

var counter = 0,
    current = counter,
    syncFunc = function (result) {
        current = counter++;
        console.log('in sync func '+current);
        return 'from func '+current;
    },
    asyncFunc = function (result, callback) {
        current = counter++;

        setTimeout(function () {
            console.log('in async func '+current);
            callback(null, 'from func '+current);
        }, 0);
    },
    // need to convert async function into one that will return a promise
    denodeifiedAsyncFunc = q.denodeify(asyncFunc);

q.fcall(syncFunc)
    .then(
        function (result) {
            return denodeifiedAsyncFunc(result);
        }
    )
    .then(
        function (result) {
            return q.fcall(syncFunc, result);
        }
    )
    .then(
        function (result) {
            return q.fcall(syncFunc, result);
        }
    )
    .catch(function (err) {
        console.log(err.stack);
    });