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Poker Texas Holdem Cactus Kev's algorithm in JavaScript

Evaluate the score (the lower the better) of a poker hand as described in this post blog : http://suffe.cool/poker/evaluator.html. You can compare two poker hands to find out who wins or if it's a tie.

I've ported some part Cactus Kev's C code : http://suffe.cool/poker/code/

It works on browser side too although the lib is a little heavy ~102 Kb because of the use of lookup tables. But it's robust and really fast. You can evaluate all the cards combinations in few seconds.

How to install

Node.js >= 6

npm install --save poker-hand-evaluator

How to use

const PokerHand = require('poker-hand-evaluator');

const myPokerHand = new PokerHand('KS KH QC AH AD');
const hisPokerHand = new PokerHand('KD KC AS AH TD')

console.log(myPokerHand.describe());
// { hand: [ 'KS', 'KH', 'QC', 'AH', 'AD' ],
//   score: 2468,
//   rank: 'TWO_PAIRS' }

console.log(hisPokerHand.describe());
// { hand: [ 'KD', 'KC', 'AS', 'AH', 'TD' ],
//   score: 2470,
//   rank: 'TWO_PAIRS' }

console.log(myPokerHand.getRank());
// TWO_PAIRS
console.log(hisPokerHand.getRank());
// TWO_PAIRS

console.log(myPokerHand.getScore());
// 2468
console.log(hisPokerHand.getScore());
// 2470

console.log(myPokerHand.toString());
// KS KH QC AH AD
console.log(hisPokerHand.toString());
// KD KC AS AH TD


/**
 * return 1 if it's a Win
 * return 2 if it's a Loss
 * return 3 if it's a Tie
 */
console.log(myPokerHand.compareWith(hisPokerHand));
// 1

How to develop

Node.js >= 8.5.0 is necessary to run the tests

git clone https://github.com/codeKonami/poker-hand.git
cd poker-hand
# Install dev dependencies (Webpack, babel, Jest ...)
npm install
# Launch an example
npm run dev

How to test

npm run test

npm run test

This command will run the unit tests (through Jest) and will also evaluate the time it takes to evaluate all the combinations. Finally it will display 10 random comparisons.

How to build

npm run build

This command generates a pokerhand.min.js file in the dist/ folder to be used on browser. You can try an example of implementation on browser by launching a web server in the root folder.

python -m SimpleHTTPServer
# Now go to http://localhost:8000

TO DO

  • Load the C code of Kev Cactus directly in Node.js to compare the result between my code and his results.
  • Add the Paul Senzee's optimisation mentioned in the blog post here