public void OptionExistsWhenTrue()
{
bool expected = true;
Option <int> optionValue = 36;
bool result = OptionModule.Exists(_isEven, optionValue);
Assert.AreEqual(expected, result);
}
public void OptionExistsWhenNone()
{
bool expected = false;
Option <int> optionValue = Option <int> .None();
bool result = OptionModule.Exists(_isEven, optionValue);
Assert.AreEqual(expected, result);
}
/// <summary>
/// Returns true if the <paramref name="option"/> <see cref="Option{T}.IsSome"/> and the <paramref name="predicate"/> return true when applied it.
/// Otherwise, returns false.
/// </summary>
/// <typeparam name="T">The type of the option value.</typeparam>
/// <param name="predicate">A function that evaluates whether the value contained in the option is valid or not.</param>
/// <param name="option">The input option.</param>
/// <returns>
/// Returns true if the <paramref name="option"/> <see cref="Option{T}.IsSome"/> and the <paramref name="predicate"/> return true when applied it.
/// Otherwise, returns false.
/// </returns>
public static bool Exists <T>(this Option <T> option, Func <T, bool> predicate)
=> OptionModule.Exists(predicate, option);