okOrElse<E> abstract method

  1. @useResult
Result<T, E> okOrElse<E>(
  1. E calculateError()
)

Transforms an Option into a Result, mapping Some to an Ok of the contained value and None to Err of the result of calculateError.

Examples

// prints "Ok(2)"
print(const Some(2).okOrElse(() => 'none'));

// prints "Err(none)"
print(const None<int>().okOrElse(() => 'none'));

Implementation

@useResult
Result<T, E> okOrElse<E>(E Function() calculateError);