Function: orElse()
Call Signature
orElse<
T,R>(elseFn,maybe):Maybe<ValueFor<R>>
Like or, but using a function to construct the alternative Maybe.
Sometimes you need to perform an operation using other data in the environment to construct the fallback value. In these situations, you can pass a function (which may be a closure) as the elseFn to generate the fallback Maybe<T>.
Useful for transforming empty scenarios based on values in context.
Type Parameters
T
T extends object
The type of the wrapped value.
R
R extends AnyMaybe
Parameters
elseFn
() => R
The function to apply if maybe is Nothing
maybe
Maybe<T>
The maybe to use if it is Just.
Returns
Maybe<ValueFor<R>>
The maybe if it is Just, or the Maybe returned by elseFn if the maybe is Nothing.
Call Signature
orElse<
T,R>(elseFn): (maybe) =>Maybe<ValueFor<R>>
Like or, but using a function to construct the alternative Maybe.
Sometimes you need to perform an operation using other data in the environment to construct the fallback value. In these situations, you can pass a function (which may be a closure) as the elseFn to generate the fallback Maybe<T>.
Useful for transforming empty scenarios based on values in context.
Type Parameters
T
T extends object
The type of the wrapped value.
R
R extends AnyMaybe
Parameters
elseFn
() => R
The function to apply if maybe is Nothing
Returns
The maybe if it is Just, or the Maybe returned by elseFn if the maybe is Nothing.
(maybe) => Maybe<ValueFor<R>>