elm-json-field-value
This package is intended to make it easier to work with complicated JSON decoders suitable for parsing ASTs from JSON in Elm.
Install
elm-package install --yes eeue56/elm-json-field-value
Usage
import Json.Decode
import Json.Decode.FieldValue exposing (fieldValue)
type Animal = Dog | Cat
decodeAnimal : Json.Decode.Decoder Animal
decodeAnimal =
Json.Decode.oneOf
[ decodeDog
, decodeCat
]
decodeDog : Json.Decode.Decoder Animal
decodeDog =
Json.Decode.map (\_ -> Dog)
(Json.Decode.field "type" <| fieldValue "dog")
decodeCat : Json.Decode.Decoder Animal
decodeCat =
Json.Decode.map (\_ -> Cat)
(Json.Decode.field "type" <| fieldValue "cat")
