Re: Promise<void> or Promise<undefined>?, was Re: RfC: pre-LC version of Screen Orientation; deadline August 18

On Thu, Aug 14, 2014 at 1:36 PM, Marcos Caceres <> wrote:
> interface ScreenOrientation {
>     Promise<undefined> lock (OrientationLockType orientation);
> }

It doesn't make sense to put a *value* between the <>. You should put
a *type* there. I.e. it doesn't make sense to do

Promise<1> returnOne();

The thing you do is

Promise<integer> returnOne();

'void' is the type for 'nothing', so that's what should be used for
functions that only return undefined. Whether they return that
synchronously or asynchronously.

/ Jonas

Received on Thursday, 14 August 2014 23:31:31 UTC