True Myth / toolbelt / toOkOrElseErr

Function: toOkOrElseErr()

Call Signature

toOkOrElseErr<T, E>(elseFn, maybe): Result<T, E>

Transform the Maybe into a Result, using the wrapped value as the Ok value if the Maybe is Just; otherwise using elseFn to generate the Err.

Type Parameters

T

T extends object

The wrapped value.

E

E

The error type to in the Result.

Parameters

elseFn

() => E

The function which generates an error of type E.

maybe

Maybe<T>

The Maybe instance to convert.

Returns

Result<T, E>

A Result containing the value wrapped in maybe in an Ok, or the value generated by elseFn in an Err.

Call Signature

toOkOrElseErr<T, E>(elseFn): (maybe) => Result<T, E>

Transform the Maybe into a Result, using the wrapped value as the Ok value if the Maybe is Just; otherwise using elseFn to generate the Err.

Type Parameters

T

T extends object

The wrapped value.

E

E

The error type to in the Result.

Parameters

elseFn

() => E

The function which generates an error of type E.

Returns

A Result containing the value wrapped in maybe in an Ok, or the value generated by elseFn in an Err.

(maybe) => Result<T, E>