Op woensdag 26 oktober 2016 13:36:18 UTC+2 schreef Did:
>
> But It seems that, in the update function, currentBox always return
> something because it doesn't update my model... I'm obviously doing
> something wrong. But, for me, as all cells are unoccupied, this test should
> return Nothing. What's wrong ?
>
The output of the currentBox function is not Nothing, but it is Just Nothing.
A bit of a strange outcome.
If you remove the |> List.head from the currentBox function, you can see
where things go wrong.
I'm sorry, but I don't know how to debug elm code in general, and in
> particular with the elm lang try editor (I'm at work and I don't have elm
> working on my machine...)
>
Below is a quick test I did in elm lang try editor. You can copy/paste this.
With elm, it is relatively easy to test parts of your code (because all
functions are "pure", so the same input always gives the same output.)
import Html exposing (text)
type alias Box = { id : Int, player : Maybe Int }
filterRow: Int -> List Box -> Maybe Box
filterRow boxId row =
row
|> List.filter (\box -> box.id == boxId && not (box.player == Nothing))
|> List.head
currentBox boxId =
List.map (filterRow boxId) cells
|> List.head
cells =
[ [ Box 1 Nothing, Box 2 Nothing, Box 3 Nothing ]
, [ Box 4 Nothing, Box 5 Nothing, Box 6 Nothing ]
, [ Box 9 Nothing, Box 8 Nothing, Box 9 Nothing ]
]
main =
text <| toString <| currentBox 5
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