public static Option <TResult> Select <TSource, TResult>(this Option <TSource> source, Func <TSource, TResult> selector)
{
if (selector == null)
{
throw new ArgumentNullException("selector");
}
return(source.Bind(x => Option <TResult> .Return(selector(x))));
}
public static Option <TResult> SelectMany <TSource, TCollection, TResult>(
this Option <TSource> source,
Func <TSource, Option <TCollection> > collectionSelector,
Func <TSource, TCollection, TResult> resultSelector)
{
if (collectionSelector == null)
{
throw new ArgumentNullException("collectionSelector");
}
if (resultSelector == null)
{
throw new ArgumentNullException("resultSelector");
}
return(source.Bind(s => collectionSelector(s).Select(c => resultSelector(s, c))));
}