Asynchronous Loop of jQuery Deferreds (promises)

Question

I am trying to create what I think is referred to as a \"Waterfall\". I want to sequentially process an array of async functions (jQuery promises).

Here\'s a contr

Answer 1

For a waterfall, you need an async loop:

(function step(i, callback) {
    if (i < tasks.length)
        doTask(tasks[i]).then(function(res) {
            // since sequential, you'd usually use "res" here somehow
            step(i+1, callback);
        });
    else
        callback();
})(0, function(){
    console.log("all done");
});