Utility functions on undefined
Provides functionality for dealing with the 'a Js.undefined type
type +'a t = 'a Js.undefinedLocal alias for 'a Js.undefined
val return : 'a -> 'a tConstructs a value of 'a Js.undefined containing a value of 'a
val empty : 'a tThe empty value, undefined
val getUnsafe : 'a t -> 'aval getExn : 'a t -> 'aBind the contained value using the given function
If 'a Js.undefined contains a value, that value is unwrapped, mapped to a 'b using the given function a' -> 'b, then wrapped back up and returned as 'b Js.undefined
let maybeGreetWorld (maybeGreeting: string Js.undefined) =
Js.Undefined.bind maybeGreeting ~f:(fun greeting -> greeting ^ " world!")val iter : f:('a -> unit) Js.Fn.arity1 -> 'a t -> unitIterates over the contained value with the given function
If 'a Js.undefined contains a value, that value is unwrapped and applied to the given function.
let maybeSay (maybeMessage: string Js.undefined) =
Js.Undefined.iter maybeMessage ~f:(fun message -> Js.log message)val fromOption : 'a option -> 'a tMaps 'a option to 'a Js.undefined
| Some a | -> | return a |
| None | -> | empty |
val toOption : 'a t -> 'a optionMaps 'a Js.undefined to 'a option
| return a | -> | Some a |
| empty | -> | None |