public static IFilterBase <B> SelectMany <A, B>(this IFilterBase <A> filter, Func <A, IFilterBase <B> > f)
{
return(filter.Bind(f));
}
public static IFilterBase <C> SelectMany <A, B, C>(this IFilterBase <A> filter, Func <A, IFilterBase <B> > bind, Func <A, B, C> select)
{
return(filter
.Bind((a) => bind(a)
.Map((b) => select(a, b))));
}
public static IFilterBase <B> Map <A, B>(this IFilterBase <A> filter, Func <A, B> f)
{
return(filter.Bind(x => Return(f(x))));
}