Async forEach

example.js

/*
    Iterate over all elements and do some async work on each element, but ensure they all get worked on in order
*/
var arr = [1, 2, 3];

asyncForEach(arr, function(next, element) {
    console.log(element);

    //Simulate async db call
    setTimeout(next, 1000);
}, function() {
    console.log('iterating done');
});

foreach.js

var asyncForEach = exports.asyncForEach = function(arr, each, all) {
	var i = 0;

	function next() {
		if(i < arr.length) {
			i++;
			process.nextTick(function() {
				each(next, arr[i - 1]);
			});
		} else {
			if(all !== undefined) {
				all();
			}
		}
	}

	next();
};