Maybe is used to wrap an operation that might fail.
So, when you ask for the head of a list, you might get Just the head OR you
might get Nothing if the list is empty.
However, the issue here is again, an error on my part. Sorry about that.
The actual solution to the currentBox is:
currentBox =
List.concat model.cells
|> List.filter (\box -> box.id == boxId)
|> List.head
|> Maybe.withDefault (Box -1 Nothing) -- this value should never happen
in your context
You don't need to filter each row, you need to concatenate the rows into a
single list and filter that list on the id of the box.
Sorry about the misleading code from the previous message (I should have
tested it but was too lazy).
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blog: http://damoc.ro/
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