I just did this exercise too! My solution was to perform the validation
from the update function and to save the error messages in the model.
On Saturday, 25 February 2017 06:55:06 UTC, Anurup Mitra wrote:
>
> Dear Alex,
>
> This is very elegant indeed! I am bowled over by the simplicity of it a
Dear Alex,
This is very elegant indeed! I am bowled over by the simplicity of it all.
So its like chaining mathematical functions...
I'm off to read Learn You a Haskell.
Thanks a ton mate!
Best Regards
Anurup
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>
> Hi Anarup,
Try changing your update function to:
update : Msg -> Model -> Model
update msg model =
case msg of
Name name ->
unsetFlag { model | name = name }
Age age ->
unsetFlag { model | age = age }
Password password ->
unset
Peter, Witold and David,
Thanks to all of you for having taken time out to reply to a novice!
@ Peter : Your comment was an eye-opener. This wasn't obvious to me at all
because I am still to wrap my head around the FRP paradigm...
@ Witold : Your detailed reply is nothing short of exceptional.
Think of it in terms of the type signature, in your case
viewValidation : Model -> Html msg
You are giving this function a Model, and every branch of this function
must return a Html msg, nothing more, nothing less.
The function is a black box - it expects a Model as input. It will return
an H
