public void OptionBindWhenNone()
{
Option <int> optionValue = Option <int> .None();
Option <int> optionResult = OptionModule.Bind(_squareWhenEven, optionValue);
Assert.IsTrue(optionResult.IsNone);
}
public void OptionBindWhenSomeTrue()
{
int expected = 36;
Option <int> optionValue = 6;
Option <int> optionResult = OptionModule.Bind(_squareWhenEven, optionValue);
int result = optionResult.Match(value => value, () => 0);
Assert.AreEqual(expected, result);
}
/// <summary>
/// Creates a new <see cref="Option{T}"/> whose value is the result of applying the given <paramref name="binder"/> function
/// to <paramref name="option"/> value.
/// </summary>
/// <typeparam name="T">The type of the option value.</typeparam>
/// <typeparam name="TResult">The type of the option value returned by <paramref name="binder"/> function.</typeparam>
/// <param name="binder">The function to transform option value from the input option to a new <see cref="Option{T}"/>.</param>
/// <param name="option">The input option.</param>
/// <returns>
/// Returns a new <see cref="Option{T}"/> whose value is the result of applying the given <paramref name="binder"/> function
/// to <paramref name="option"/> value.
/// </returns>
public static Option <TResult> Bind <T, TResult>(this Option <T> option, Func <T, Option <TResult> > binder)
=> OptionModule.Bind(binder, option);