YUI 3 Task

This module includes a utility for simplifying the use of promises by making them behave as synchronous code. It's targeted for Spider Monkey and the latest versions of V8 (Chrome 29 and upwards) with the --harmony flag enabled.

Use it by including the gallery-task module and passing a generator function to the Y.task utility:

YUI({
    gallery: 'gallery-2013.05.15-21-12'
}).use('json-parse', 'gallery-io-utils', 'gallery-task', function (Y) {
    
    // The function* is the syntax for EcmaScript 6 generators
    Y.task(function* () {
        var data = yield Y.io.getJSON('/foo');
        var result = yield Y.io.postJSON('/bar', {data: data});
        Y.log(result.field);
    });

});

Credits

Y.task is heavily based on Task.js, by David Herman