Callback after all asynchronous forEach callbacks are completed

Question

As the title suggests. How do I do this?

I want to call whenAllDone() after the forEach-loop has gone through each element and done some asynchronous p

Answer 1

You shouldn't need a callback for iterating through a list. Just add the end() call after the loop.

posts.forEach(function(v, i){
   res.write(v + ". Index " + i);
});
res.end();