Promises/A+ logo


A promises utility to be used by any utility that performs asynchronous operations. This implementation is compliant with the Promises A+ spec, a standard written by members of the JavaScript community.

Create promises by calling the Y.Promise constructor. Inherit from the Y.Promise constructor to return customized promises that have extra methods. The then method returns a promise based on its constructor, so extended promises will return the right promise type from then.

Make a Donation