Queuing promises

Question

I use mbostock/queue for queuing few async operation. It is more to rate limit (UI generate few events, where the backend can process it slowly), and also to make sure they

Answer 1

Chained Promises

Angular's $q implementation allows you to chain promises, and then handle resolves of those promises according to your own logic. The methods are a bit different than mbostock/queue, but the intent is the same. Create a function that determines how your defered will be resolved (creating a promise), then make these available to a higher level controller/service for specific resolution handling.

Angular uses $q.defer() to return promise objects, which can then be called in the order you wish inside your application logic. (or even skipped, mutated, intercepted, etc...).

I'll throw down some code, but I found this 7 minute video at egghead.io to be the best short demo: https://egghead.io/lessons/angularjs-chained-promises, and it will do a FAR better job of explaining. Thomas (the presenter) builds a very small flight dashboard app that queues up weather and flight data, and processes that queue when a user queries their itenerary. ThomasBurleson/angularjs-FlightDashboard

I will be setting up a smaller demonstration on codepen, using the situation of 'eating at a restaurant' to demonstrate this concept: http://codepen.io/LongLiveCHIEF/pen/uLyHx

Code examples here:

https://gist.github.com/LongLiveCHIEF/4c5432d1c2fb2fdf937d