This type is very special. The definition in Elm is solely a placeholder,
the actual implementation is in native code. You should not think further
about this trickery, assuming you want to program Elm, not
2016-09-21 11:30 GMT+02:00 'Rupert Smith' via Elm Discuss <
> On Tuesday, September 20, 2016 at 4:25:42 PM UTC+1, Rupert Smith wrote:
>> type Cmd msg = Cmd
> I am still a bit perplexed by this. It is a parameterized type, but the
> parameter is thrown away and not used. I can only create one of them, since
> their is only one constructor.
> Given that, why do I have to use Cmd.none - if the only isntance of Cmd
> that can be constructed is Cmd, why not simply use Cmd instead of Cmd.none?
> Does this exist purely to make the commands created by the update function
> have a particular type, in order to constrain where and how that update
> function can be used?
> If the constructor takes no args, then Cmd must be encapsulating no
> context - I kind of thought the commands would be constructed with some
> context that tells the program what the command is, or how to execute it.
> That is a constructor like this:
> type Cmd msg = Cmd msg
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