mapErr<F> method

Result<T, F> mapErr<F>(F mapFn(E))

Maps a Result<T, E> to a Result<T, F> using the given function with the held value.

Returns:

• Ok<T, F> if this Result is Ok<T, E>.
• Err<T, F> if this Result is Err<T, E>.

See also: Rust: Result::map_err()

Implementation

Result<T, F> mapErr<F>(F Function(E) mapFn) {
  return switch (this) {
    Ok(:T v) => Ok(v),
    Err(:E e) => Err(mapFn(e)),
  };
}