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.

6-}

8import JavaScript (JSObject)

9import Native.JavaScript

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

12Arrays are converted into lists, nested objects are allowed.

13No `null` values or non-homogeneous arrays.

15 -- OK objects

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

17 { errorLevel:10, critical:true }

19 -- BAD objects

20 { answer:null }

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

23toRecord : JSObject -> a

24toRecord = Native.JavaScript.toRecord

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

27Lists become arrays, nested records are allowed. No ADTs.

29 -- OK records

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

31 { errorLevel=10, critical=True }

33 -- BAD records

34 { answer = Nothing }

35 { result = Left "An error occurred" }

37fromRecord : a -> JSObject

38fromRecord = Native.JavaScript.fromRecord