Getting rid of delta transform and suggestion

[shredding]

I'm using your class as base for one of my projects (thanks!) and since i did not get my head around your delta_transform method I ended up like this, maybe that's easier?

def straight_flush?
    flush? and straight?
end

def straight?
        by_face

        # I named my version cards, it's the array of cards
        temp_cards = cards.dup

        if temp_cards[0].face == Card::FACE_VALUES['A'] and temp_cards[1].face != Card::FACE_VALUES['K']
          # it's not an ace high straight, so we move the ace to the end
          # to test for a low straight
          ace = temp_cards.shift
          temp_cards << Card.new("L#{Card::SUITS[ace.suit]}")
        end

        face_value = temp_cards[0].face

        temp_cards.each do |c|
            return false if face_value != c.face
          face_value -= 1
        end
        true
end

I as well added a by_groups func:

def by_groups
        # technically, we treat single cards as single group in this loop
        pairs = []

        until @cards.size == 0
          reference = @cards[0]
          pair, @cards = @cards.partition { |c| c.face == reference.face}
          pairs.push(pair)
        end
        pairs.sort_by! { |a| [a.size, a[0].face] }.reverse!
        pairs.each { |pair| pair.each { |c| @cards << c }}
        self
      end

It's needed for what I do, but maybe of interest here as well? I could form a pull request if you're interested at all :)

[robolson]

Hi @shredding. I agree that the delta_transform method is crazy confusing although I documented it much better in late December to make it more understandable (4c2402b).

I'm sure it could be changed, but the straight? method as you've written it doesn't match the method contract of returning an array in the format [[5, high_card], arranged_hand].

I think you're version would be slower because it creates more objects. The current versions of straight and delta_transform use regular expressions which I think are faster.

However, yours is more approachable. If you could get it to pass the test suite and test/integration/test_a_million_hands.rb (see comment at top of file for how to run). Then I think I would put it in.

I looked at by_groups quickly but I do not understand what it is doing. You would need to post examples.

[shredding]

by_groups is sorting a hand like A79A9 to AA997.