Hi Bryce,
In general, that's a good guess. However, in the http.Server case, the
Server constructor includes a "new" guard:
function Server(requestListener) {
> if (!(this instanceof Server)) return new Server(requestListener);
> net.Server.call(this, { allowHalfOpen: true });
> ...
> }
So, as I read it, the following should all be equivalent:
s = http.createServer([listener])
> s = http.Server([listener])
> s = new http.Server([listener])
btw, here's the code if you want to have a look:
https://github.com/joyent/node/blob/v0.8.23-release/lib/http.js#L1748
Best,
-- Joel
On Monday, April 15, 2013 7:41:34 AM UTC-7, [email protected] wrote:
>
> One simple reason could be to allow instanceof checks the http.Server
>
> -Bryce
>
>
> On Mon, Apr 15, 2013 at 7:36 AM, Joel Brandt <[email protected]<javascript:>
> > wrote:
>
>> 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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