Js.NullableProvide utilities around null_undefined
Contains functionality for dealing with values that can be both null and undefined
let return: 'a => t('a);Constructs a value of 'a Js.null_undefined containing a value of 'a
let isNullable: t('a) => bool;Returns true if the given value is null or undefined, false otherwise
let null: t('a);The null value of type 'a Js.null_undefined
let undefined: t('a);The undefined value of type 'a Js.null_undefined
let map: f:Js.Fn.arity1(('a => 'b)) => t('a) => t('b);let bind: f:Js.Fn.arity1(('a => t('b))) => t('a) => t('b);Binds the contained value using the given function
If 'a Js.null_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.null_undefined
let maybeGreetWorld (maybeGreeting: string Js.null_undefined) =
Js.Undefined.bind maybeGreeting ~f:(fun greeting -> greeting ^ " world!")let iter: f:Js.Fn.arity1(('a => unit)) => t('a) => unit;Iterates over the contained value with the given function
If 'a Js.null_undefined contains a value, that value is unwrapped and applied to the given function.
let maybeSay (maybeMessage: string Js.null_undefined) =
Js.Null_undefined.iter maybeMessage ~f:(fun message -> Js.log message)let fromOption: option('a) => t('a);Maps 'a option to 'a Js.null_undefined
| Some a | -> | return a |
| None | -> | undefined |
let toOption: t('a) => option('a);Maps 'a Js.null_undefined to 'a option
| return a | -> | Some a |
| undefined | -> | None |
| null | -> | None |