Hi, this morning I got into a weird bug with a value obtained from a
decoder. I got elm code compiling but runtime error.
I have this inside an update:
let
groundtruth : Maybe RLE
groundtruth =
Decode.decodeString RLE.decode rleString
|> Result.toMaybe
-- The problem appears when I add this code:
groundtruthMatrix : Maybe (Matrix Bool)
groundtruthMatrix =
groundtruth
|> Maybe.map RLE.toMatrix
in
( { model | groundtruth = groundtruth }
, Cmd.none
)
where the signature of RLE.toMatrix is:
-- Convert a RLE image to a Matrix.
toMatrix : RLE -> Matrix Bool
and this fonction is working (according to manual tests in REPL).
The error I get when adding the groundthruthMatrix definition is in
chromium:
main.js:790 Uncaught TypeError: Cannot read property 'length' of undefined
at calcToRemove (main.js:790)
at Function.append [as func] (main.js:683)
at A2 (main.js:92)
at main.js:16660
at main.js:7
at Function.func (main.js:8581)
at A2 (main.js:92)
at indexedMap_ (main.js:498)
at indexedMap_ (main.js:499)
at Function.indexedMap [as func] (main.js:480)
calcToRemove @ main.js:790
append @ main.js:683
A2 @ main.js:92
(anonymous) @ main.js:16660
(anonymous) @ main.js:7
(anonymous) @ main.js:8581
A2 @ main.js:92
indexedMap_ @ main.js:498
indexedMap_ @ main.js:499
indexedMap @ main.js:480
A2 @ main.js:92
(anonymous) @ main.js:8577
(anonymous) @ main.js:7
A3 @ main.js:99
_mpizenberg$elm_image_annotation$RLE$toMatrix @ main.js:16656
(anonymous) @ main.js:16776
(anonymous) @ main.js:1887
A2 @ main.js:92
(anonymous) @ main.js:16772
A2 @ main.js:92
(anonymous) @ main.js:3439
step @ main.js:4074
work @ main.js:4132
Do you think there is a way to correct this issue?
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