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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

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

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>

Parameters ​

maybe ​

Maybe<T>

Returns ​

Result<T, E>