Data.Foreign.NullOrUndefined

newtype NullOrUndefined a

A newtype wrapper whose IsForeign instance correctly handles null and undefined values.

Conceptually, this type represents values which may be null or undefined.

Constructors

• NullOrUndefined (Maybe a)

Instances

• Newtype (NullOrUndefined a) _
• (Eq a) => Eq (NullOrUndefined a)
• (Ord a) => Ord (NullOrUndefined a)
• (Show a) => Show (NullOrUndefined a)

unNullOrUndefined :: forall a. NullOrUndefined a -> Maybe a

Unwrap a NullOrUndefined value

readNullOrUndefined :: forall a. (Foreign -> F a) -> Foreign -> F (NullOrUndefined a)

Read a NullOrUndefined value

undefined :: Foreign