public static async Task <Option <TValue> > WhereAsync <TValue>(this Option <TValue> option, Func <TValue, Task <bool> > predicate)
{
if (predicate == null)
{
throw new ArgumentNullException(nameof(predicate));
}
if (option.TryGetValue(out var some))
{
return(Option.Create(await predicate.Invoke(some), some));
}
return(Option.None <TValue>());
}
public static Option <TValue> OfType <TValue>(this Option <object> option) => option.Match(value => Option.Create(value is TValue, () => (TValue)value), Option.None <TValue>);