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[](http://travis-ci.org/kriskowal/q) [](https://cdnjs.com/libraries/q.js) If a function cannot return a value or throw an exception without blocking, it can return a promise instead. A promise is an object that represents the return value or the thrown exception that the function may eventually provide. A promise can also be used as a proxy for a [remote object][Q-Connection] to overcome latency. [Q-Connection]: https://github.com/kriskowal/q-connection On the first pass, promises can mitigate the “[Pyramid of Doom][POD]”: the situation where code marches to the right faster than it marches forward. [POD]: http://calculist.org/blog/2011/12/14/why-coroutines-wont-work-on-the-web/ ```javascript step1(function (value1) { step2(value1, function(value2) { step3(value2, function(value3) { step4(value3, function(value4) { // Do something with value4 }); }); }); }); ``` With a promise library, you can flatten the pyramid. ```javascript Q.fcall(promisedStep1) .then(promisedStep2) .then(promisedStep3) .then(promisedStep4) .then(function (value4) { // Do something with value4 }) .catch(function (error) { // Handle any error from all above steps }) .done(); ``` With this approach, you also get implicit error propagation, just like `try`, `catch`, and `finally`. An error in `promisedStep1` will flow all the way to the `catch` function, where it’s caught and handled. (Here `promisedStepN` is a version of `stepN` that returns a promise.) The callback approach is called an “inversion of control”. A function that accepts a callback instead of a return value is saying, “Don’t call me, I’ll call you.”. Promises [un-invert][IOC] the inversion, cleanly separating the input arguments from control flow arguments. This simplifies the use and creation of API’s, particularly variadic, rest and spread arguments. [IOC]: http://www.slideshare.net/domenicdenicola/callbacks-promises-and-coroutines-oh-my-the-evolution-of-asynchronicity-in-javascript ## Getting Started The Q module can be loaded as: - A ``