public void EitherToOptionRightWhenLeft()
{
int expected = 0;
Either <string, int> either = "Hello World";
Option <int> optionResult =
EitherModule.ToOptionRight(either);
int result = optionResult.Match(value => value, () => 0);
Assert.AreEqual(expected, result);
}
/// <summary>
/// Convert the <see cref="Either{TLeft, TRight}"/> to a <see cref="Option{T}"/> where T is <typeparamref name="TRight"/>.
/// </summary>
/// <typeparam name="TLeft">The type of the left value.</typeparam>
/// <typeparam name="TRight">The type of the right value.</typeparam>
/// <param name="either">The input either.</param>
/// <returns>
/// Returns an <see cref="Option{T}"/> where T is <typeparamref name="TRight"/>.
/// The option value state is <see cref="Option{T}.Some(T)"/> when <paramref name="either"/> <see cref="Either{TLeft, TRight}.IsRight"/>, otherwise is <see cref="Option{T}.None"/>
/// </returns>
public static Option <TRight> ToOptionRight <TLeft, TRight>(this Either <TLeft, TRight> either)
=> EitherModule.ToOptionRight(either);