libraries/JavaScript/Experimental.elm · elk

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elk/libraries/JavaScript/Experimental.elm

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1module JavaScript.Experimental where

2{-| A pair of very experimental functions for converting between

3Elm records and JavaScript objects. It currently uses a best effort

4conversion that can cause runtime errors. This API should change and

5improve as we find its key failings.

7# Converting between Elm records and JS Objects

8@docs toRecord, fromRecord

9-}

11import Native.JavaScript

13data RawObject = RawObject

15{-| Turn arbitrary JavaScript objects into Elm records.

16Arrays are converted into lists, nested objects are allowed.

17No `null` values or non-homogeneous arrays.

19 -- OK objects

20 { student:"Steve", scores:[83,94,99,72] }

21 { errorLevel:10, critical:true }

23 -- BAD objects

24 { answer:null }

25 { info:[true,42,'what'] }

27toRecord : RawObject -> a

28toRecord = Native.JavaScript.toRecord

30{-| Turn arbitrary Elm records into JavaScript objects.

31Lists become arrays, nested records are allowed. No ADTs.

33 -- OK records

34 { student="Steve", scores=[83,94,99,72] }

35 { errorLevel=10, critical=True }

37 -- BAD records

38 { answer = Nothing }

39 { result = Left "An error occurred" }

41fromRecord : a -> RawObject

42fromRecord = Native.JavaScript.fromRecord