Hi,

I'm curious about a patter that occurs at multiple places in the core node 
library.

In the http module (and other places), there are both exported constructors 
and exported factory functions for the same objects (e.g. http.Server() and 
http.createServer()). In many cases, the factory functions are just 
wrappers around the constructor. For example, the code for 
http.createServer in v0.8.23 is simply:

exports.createServer = function(requestListener) {
>   return new Server(requestListener);
> };


Can anyone explain why both are exported? Since createServer exists, I 
assume it's preferable to use that (perhaps for future-proofing one's 
code)? I'd also be interested to read any thoughts about when factory 
functions are preferable to constructors in the JS world.

Thanks,
  -- Joel

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