Verhoeff's Dihedral Group D5 Check raw port from JS

verhoef.cs

using System;
					
public class Program
{
	int[][] F = new int[8][]; 
    int[][] Op = new int[10][];
	int[] Inv = new int[] { 0, 4, 3, 2, 1, 5, 6, 7, 8, 9 };
	
	public Program() 
	{
		F[0] = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
		F[1] = new int[] { 1, 5, 7, 6, 2, 8, 3, 0, 9, 4 };
		for ( var i = 2; i < 8; i++ )
		{
			F[i] = new int[10];
			for ( var j = 0; j < 10; j++ )
				F[i][j] = F[i-1][F[1][j]];
		}
		Op[0] = new int[]{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
		Op[1] = new int[]{ 1, 2, 3, 4, 0, 6, 7, 8, 9, 5 };
		Op[2] = new int[]{ 2, 3, 4, 0, 1, 7, 8, 9, 5, 6 };
		Op[3] = new int[]{ 3, 4, 0, 1, 2, 8, 9, 5, 6, 7 };
		Op[4] = new int[]{ 4, 0, 1, 2, 3, 9, 5, 6, 7, 8 };
		Op[5] = new int[]{ 5, 9, 8, 7, 6, 0, 4, 3, 2, 1 };
		Op[6] = new int[]{ 6, 5, 9, 8, 7, 1, 0, 4, 3, 2 };
		Op[7] = new int[]{ 7, 6, 5, 9, 8, 2, 1, 0, 4, 3 };
		Op[8] = new int[]{ 8, 7, 6, 5, 9, 3, 2, 1, 0, 4 };
		Op[9] = new int[]{ 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 };


	}
	string ReverseStr(string str)
	{
		var rev = "";
		for ( var i = str.Length - 1; i >= 0; i-- )
			rev = rev + str[i];
		return rev;
	}

	bool Check(string code)
	{
		var a = ReverseStr(code);
		var check = 0;
		for ( var i=0; i < a.Length; i++ )
			check = Op[check][F[i%8][int.Parse(a[i]+"")]];
		return check == 0; 

	}

	string Compute(string code)
	{
		var a = "x"+ReverseStr(code);
		var check = 0;
		for ( var i = 1; i < a.Length; i++ )
			check = Op[check][F[i%8][int.Parse(a[i]+"")]];
		return code + Inv[check];
	}

	
	
	public static void Main()
	{
		var code = "4535";
		var p = new Program();
		
		var code1 = p.Compute(code);
		var code2 = p.Compute(code1);
		
		Console.WriteLine(code2);
		
		Console.WriteLine(p.Check(code2));
		Console.WriteLine(p.Check(code2.Substring(0, code2.Length-1)));
		
						  
		
		
		Console.WriteLine("Hello World");
	}
}