Don't think that will work because c is of type Maybe Square, not Maybe
Cell.
One further question - if I define
let null_square = { cell = Empty, num = 0 }
let get_square maybe_square =
case maybe_cell of
Nothing: null_square
Just s : s
let get_letter maybe_square =
case maybe_square of
{ Letter s } -> s
_ -> ""
would that be introducing an inefficient creation of a null_square every
time I call get_letter or is it just a cheap reference?
martin
On Fri, Sep 23, 2016 at 12:04 PM, Simon <[email protected]> wrote:
> This should work
>
> case c of
> Just (Letter s) ->
> s
> _ -> ""
>
>
>
> On Friday, 23 September 2016 03:50:19 UTC+2, Martin DeMello wrote:
>>
>> If I have the following code:
>>
>> type Cell = Empty | Letter String
>>
>> type alias Square =
>> { cell : Cell
>> , num : Int
>> }
>>
>> and c : Maybe Square,
>>
>> can I do the following in a single match?
>>
>> case c of
>> Just { cell } ->
>> case cell of
>> Letter s -> s
>> _ -> ""
>> _ -> ""
>>
>> that is, i conceptually want
>>
>> case c of
>> Just { cell = Letter s } -> s
>> _ -> ""
>>
>> martin
>>
> --
> You received this message because you are subscribed to the Google Groups
> "Elm Discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected].
> For more options, visit https://groups.google.com/d/optout.
>
--
You received this message because you are subscribed to the Google Groups "Elm
Discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
