gistfile1.js

// Not all of the pipeline is async, but some of it is, so even the non-async functions
// get lifted into a promise (a compliant Promises/A+ impl will lift your functions for free)
Q.delay(100)
    .then(function (_) { return { a: 1 }})
    .then(function (acc) { return _.extend(acc, { b: 2 }); })
    .then(function (acc) { return _.extend(acc, { a: acc.a + 1 }); })
    .then(_.bind(this.setState, this))
    .done();