Yajson.Object

Module for object specific helpers.

Access

keys : Json -> List String

Takes a json object and returns its keys as list of strings. Returns an empty list if the value isn't an object.

keys (ofInt [ ( "I", 1 ), ( "II", 2 ), ( "III", 3 ) ])
    == [ "I", "II", "III" ]

Takes a json object and returns its values as list of strings. Returns an empty list if the value isn't an object.

values (ofInt [ ( "I" ), 1, ( "II" ), 2, ( "III" ), 3 ])
    == [ Number 1, Number 2, Number 3 ]

map : (String -> Json -> a) -> Json -> List a

Maps a json object.

mapKeys : (String -> a) -> Json -> List ( a, Json )

Like map, but maps only the keys.

mapValues : (Json -> a) -> Json -> List ( String, a )

Like map, but maps only the values.

filterMap : (String -> Json -> Maybe a) -> Json -> List a

Given a funcion fn : String -> Json -> Maybe a maps a json object, removes Nothings and returns a list.

If the json value is not an object returns an empty list.

filterMapKeys : (String -> Maybe a) -> Json -> List ( a, Json )

Like filterMap, but fn maps only the keys.

filterMapValues : (Json -> Maybe a) -> Json -> List ( String, a )

Like filterMap, but fn maps only the values.

ofString : List ( String, String ) -> Json

Wraps a list of string pairs in a json object.

ofString [ ( "name", "value" ) ]
    == Object [ ( "name", String "value" ) ]

ofFloat : List ( String, Float ) -> Json

Wraps a list of pairs of string and float in a json object.

ofFloat [ ( "pi", 3.14 ), ( "e", 2.718 ) ]
    == Object [ ( "pi", Number 3.14 ), ( "e", Number 2.718 ) ]

ofInt : List ( String, Int ) -> Json

Wraps a list of pairs of string and int in a json object.

ofInt [ ( "I", 1 ), ( "II", 2 ) ]
    == Object [ ( "I", Number 1 ), ( "II", Number 2 ) ]

ofBool : List ( String, Bool ) -> Json

Wraps a list of pairs of string and bool in a json object.

ofBool [ ( "hot", True ), ( "cold", False ) ]
    == Object [ ( "hot", Bool True ), ( "cold", Bool False ) ]