Promise that returns a promise?

Question

I am trying to create the following promise syntaxes:

I want the secondary then to be called after the post function, how can I do that?

randomBytes.then(function() {
   return requestPromise.post(....);
}).then(function() {
   // I want this part to be called after the POST
});

Answer 1

The fact this already works (as the comment said - assuming .post returns a promise) is pretty much the point of then - it allows you to wait for stuff.

If you return a promise from then, the chain will assume its state and thus will only call the following segments after it has completed.

randomBytes.then(function() {
   return requestPromise.post(....);
}).then(function() {
   // WILL ALWAYS BE CALLED AFTER THE POST
});