Poker library in Ruby Build Status


Rob Olson

first name



Ruby-Poker handles the logic for getting the rank of a poker hand. It can also be used to compare two or more hands to determine which hand has the highest poker value.

Card representations can be passed to the PokerHand constructor as a string or an array. Face cards (cards ten, jack, queen, king, and ace) are created using their letter representation (T, J, Q, K, A).


gem install ruby-poker


require 'rubygems'
require 'ruby-poker'

hand1 ="8H 9C TC JD QH")
hand2 =["3D", "3C", "3S", "KD", "AH"])
puts hand1                => 8h 9c Tc Jd Qh (Straight)
puts hand1.just_cards     => 8h 9c Tc Jd Qh
puts hand1.rank           => Straight
puts hand2                => 3d 3c 3s Kd Ah (Three of a kind)
puts hand2.rank           => Three of a kind
puts hand1 > hand2        => true


By default ruby-poker will not raise an exception if you add the same card to a hand twice. You can tell ruby-poker to not allow duplicates by doing the following

PokerHand.allow_duplicates = false

Place that line near the beginning of your program. The change is program wide so once allow_duplicates is set to false, all poker hands will raise an exception if a duplicate card is added to the hand.


Ruby-Poker is compatible with Ruby 1.8, Ruby 1.9, and Ruby 2.X.


View the generated documentation for ruby-poker on


In the 0.2.0 release Patrick Hurley's Texas Holdem code from was merged into ruby-poker.


This is free software; you can redistribute it and/or modify it under the terms of the BSD license. See LICENSE for more details.