eachAsync.js

function eachAsync(collection, iterator, callback) {
    var iterate = function(i) {
        setTimeout(function() {
            iterator(collection[i]);
            if (i < collection.length-1) {
                iterate(i + 1);
            } else {
                if(callback) callback();
            }
        }, 0);
    };
    iterate(0 );
}