okOrElse<E> method

Result<T, E> okOrElse<E>(E elseFn())

Converts this Option<T> into a Result<T, E> using the returned value from elseFn if None.

elseFn will only be evaluated if this Option is None.

Returns:

• Ok<T, E> if this Option is Some<T>.
• Err<T, E> using the value returned by elseFn if this Option is None<T>.

See also: Rust: Option::ok_or_else()

Implementation

Result<T, E> okOrElse<E>(E Function() elseFn) {
  return switch (this) {
    Some(:T v) => Ok(v),
    None() => Err(elseFn()),
  };
}