// Test with Recursive2
private static void Test2()
{
Recursive2 <int, int> fibRec = f => n => n > 1 ? f(f)(n - 1) + f(f)(n - 2) : n;
Func <int, int> fib = fibRec(fibRec);
Console.WriteLine($"Wes Dyer: fib(6) = {fib(6)}"); // 8
}
// Moving g outside
private static void Test5()
{
Func <Func <int, int>, Func <int, int> > g = h => m => m > 1 ? h(m - 1) + h(m - 2) : m;
Recursive2 <int, int> fibRec = f => n => g(f(f))(n);
Func <int, int> fib = fibRec(fibRec);
Console.WriteLine($"Wes Dyer: fib(6) = {fib(6)}"); // 8
}
private static void Test3()
{
Recursive2 <int, int> fibRec = f => n =>
{
Func <Func <int, int>, int, int> g = (h, m) => m > 1 ? h(m - 1) + h(m - 2) : m;
return(g(f(f), n));
};
Func <int, int> fib = fibRec(fibRec);
Console.WriteLine($"Wes Dyer: fib(6) = {fib(6)}"); // 8
}
public static void Test()
{
object x1 = new Recursive2 <int, int>(null);
object x2 = new Mixed2 <int, int>(null, null, null);
object x3 = new NonRecursive2 <int, int>(null);
object x4 = new Expansive2 <int, int>(null);
object y1 = new Recursive2 <string, string>(null);
object y2 = new Mixed2 <string, string>(null, null, null);
object y3 = new NonRecursive2 <string, string>(null);
object y4 = new Expansive2 <string, string>(null);
}
public Recursive2(Recursive2 <A, B> a1)
{
f1 = a1;
}
// CreateFib
static Func <int, int> CreateFib(Func <Func <int, int>, Func <int, int> > g)
{
Recursive2 <int, int> fibRec = f => n => g(f(f))(n);
return(fibRec(fibRec));
}
// Y
private static Func <A, R> Y <A, R>(Func <Func <A, R>, Func <A, R> > f)
{
Recursive2 <A, R> rec = r => a => f(r(r))(a);
return(rec(rec));
}