unwrapErr

function Result.unwrapErr(result: Result<T, E>): E

Unwraps the Err value from the result. If the result is an Ok, throws a ResultError with a default message.

Example

data-first

Result.unwrapErr(err("fail"));
// "fail"

Result.unwrapErr(ok(5));
// throws ResultError("Called Ok.unwrapErr()")

data-last

pipe(err("fail"), Result.unwrapErr());
// "fail"