public static int LargeStraight(this YatzyDice dice)
{
var groupDice = dice.GroupDice();
return(groupDice.Count == 5 && groupDice.First().Key == 6
? 20
: 0);
}
public static int ThreeOfAKind(this YatzyDice dice)
{
var threeOfAKind = dice.GroupDice().WhereCountIsAtLeast(3);
return(threeOfAKind.Any()
? threeOfAKind[0].Key * 3
: 0);
}
public static int TwoPair(this YatzyDice dice)
{
var pairs = dice.GroupDice().WhereCountIsAtLeast(2);
return(pairs.Length == 2
? pairs[0].Key * 2 + pairs[1].Key * 2
: 0);
}
public static int FullHouse(this YatzyDice dice)
{
var groups = dice.GroupDice();
return(groups.Count == 2
? groups.Sum(g => g.Key * g.Value)
: 0);
}
public static int OnePair(this YatzyDice dice)
{
var pairs = dice.GroupDice().WhereCountIsAtLeast(2);
return(pairs.Any()
? pairs.First().Key * 2
: 0);
}
public static int SmallStraight(this YatzyDice dice)
{
return(dice.GroupDice().Count == 5
? 15
: 0);
}
public static int Chance(this YatzyDice dice)
{
return(dice.Sum());
}
public static int Sixes(this YatzyDice dice)
{
return(dice.FilteredSumBy(6));
}
public static int Fives(this YatzyDice dice)
{
return(dice.FilteredSumBy(5));
}
public static int Fours(this YatzyDice dice)
{
return(dice.FilteredSumBy(4));
}
public static int Threes(this YatzyDice dice)
{
return(dice.FilteredSumBy(3));
}
public static int Twos(this YatzyDice dice)
{
return(dice.FilteredSumBy(2));
}
public static int Ones(this YatzyDice dice)
{
return(dice.FilteredSumBy(1));
}
private static IDictionary <int, int> GroupDice(this YatzyDice dice)
{
return(dice.GroupBy(i => i).OrderByDescending(pair => pair.Key).ToDictionary(g => g.Key, g => g.Count()));
}
public static int Yatzy(this YatzyDice dice)
{
return(dice.GroupDice().Count == 1
? 50
: 0);
}
private static int FilteredSumBy(this YatzyDice dice, int by)
{
return(dice.Where(i => i == by).Sum());
}