Skip to content

Instantly share code, notes, and snippets.

What would you like to do?
var urlList = model.getURLs();
var loadAndParse = function (url)
// both load() and parse() are promise based functions
return load(url).then(parse);
* Allows for the sequentially calling of promise based functions by iterating over a list of
* items and then calling the next promise based function when the previous one has resolved.
* @param {array} arr List of values or objects used to pass into the promise-based `iterator`
* parameter function.
* @param {function} iterator The promise-based function to call with an item from the `arr` parameter.
* @returns {promise}
var promiseLoopSequence = function (arr, iterator)
// create a empty promise to start our series (so we can use `then`)
// we save Q to qPromise so JSLint doesn't complain about no "new" keyword
var qPromise = Q;
var currentPromise = qPromise();
var promises = (el)
return currentPromise = currentPromise.then(function ()
// execute the next function after the previous has resolved successfully
return iterator(el);
// group the results and return the group promise
return Q.all(promises);
return promiseLoopSequence(urlList, loadAndParse);
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.