phe
v0.6.0
Published
Poker hand evaluator.
Downloads
90
Readme
phe
Poker hand evaluator, a port of PokerHandEvaluator.
It's super fast even though still 3x slower than the C version it was ported from, but hey you can use this directly with Node.js or even in the browser.
It's fast, cause it's using a hash algorithm relying on masking and tables. However the table data isn't huge like I've seen in other projects. This is possible because flushes are considered separately from other rankings
I highly recommend reading the informative writeup on how this all works.
const { rankBoard, rankDescription } = require('phe')
const board = 'As Ks 4h Ad Kd'
const rank = rankBoard(board)
const name = rankDescription[rank]
console.log('%s is a %s', board, name)
As Ks 4h Ad Kd is a Two Pair
Installation
npm install phe
Table of Contents generated with DocToc
API
evaluateCardCodes
Evaluates the 5 - 7 card codes to arrive at a number representing the hand strength, smaller is better.
Parameters
Returns Number the strength of the hand comprised by the card codes
evaluateCards
Evaluates the 5 - 7 cards to arrive at a number representing the hand strength, smaller is better.
Parameters
Returns Number the strength of the hand comprised by the cards
evaluateCardsFast
Same as evaluateCards
but skips cards
argument type check to be more
performant.
Parameters
cards
evaluateBoard
Evaluates the given board of 5 to 7 cards provided as part of the board to arrive at a number representing the hand strength, smaller is better.
Parameters
board
String the board, i.e.'Ah Ks Td 3c Ad'
Returns Number the strength of the hand comprised by the cards of the board
rankCards
Evaluates the 5 - 7 cards and then calculates the hand rank.
Parameters
Returns Number the rank of the hand comprised by the cards, i.e. 1
for
FOUR_OF_A_KIND
(enumerated in ranks)
rankCardsFast
Same as rankCards
but skips cards
argument type check to be more
performant.
Parameters
cards
rankCardCodes
Evaluates the 5 - 7 card codes and then calculates the hand rank.
Parameters
Returns Number the rank of the hand comprised by the card codes, i.e. 1
for
FOUR_OF_A_KIND
(enumerated in ranks)
rankBoard
Evaluates the given board of 5 to 7 cards provided as part of the board to and then calculates the hand rank.
Parameters
board
String the board, i.e.'Ah Ks Td 3c Ad'
Returns Number the rank of the hand comprised by the cards, i.e. 1
for
FOUR_OF_A_KIND
(enumerated in ranks)
setCardCodes
Converts a set of cards to card codes.
Parameters
Returns Set<Number> card code set
setStringifyCardCodes
Converts a set of card codes to their string representations.
Parameters
Returns Set<String> set with string representations of the card codes,
i.e. Set({'Ah', 'Ks', 'Td', '3c, 'Ad'})
ranks
Enumeration of possible hand ranks, each rank is a number from 0-8.
STRAIGHT_FLUSH
FOUR_OF_A_KIND
FULL_HOUSE
FLUSH
STRAIGHT
THREE_OF_A_KIND
TWO_PAIR
ONE_PAIR
HIGH_CARD
rankDescription
Provides a description of a hand rank number. It's an {Array} which can be indexed into with the hand rank in order to retrieve the matching description.
Example: rankDescription[rank.FULL_HOUSE] === 'Full House'
handRank
Converts a hand strength number into a hand rank number
0 - 8
for STRAIGHT_FLUSH - HIGH_CARD
.
Parameters
val
Number hand strength (result of anevaluate
function)
Returns Number the hand rank
rankCodes
The ranks of the cards sorted highest to lowest.
- 2 = 0
- 3 = 1
- 4 = 2
- 5 = 2
- 6 = 4
- 7 = 5
- 8 = 6
- 9 = 7
- T = 8
- J = 9
- Q = 10
- K = 11
- A = 12
6 bits each.
Returns Object the ranks indexed as described above
suitCodes
The suitCodes
- s = 0
- h = 1
- d = 2
- c = 3
Returns Object the suits indexed as described above
stringifyCardCode
Converts the given card code into a string presentation.
Parameters
code
Number the card code, i.e. obtained viacardCode(rank, suit)
.
Returns String a string representation of the card in question, i.e. Ah
stringifyRank
Converts the given rank index into a rank.
Parameters
rank
Number the rank to stringify, i.e.0b000100
Returns String the string of the rank, i.e. '2'
stringifySuit
Converts the given suit index to a suit.
Parameters
suit
Number the suit to stringify, i.e.0b1
Returns String the string of the sut, i.e. 'c'
(clubs)
cardCode
Determines the code for the given hand.
Parameters
Returns Number the card code that can be used to further evaluate the hand
cardCodes
Determines the code for the given hands.
Parameters
Returns Array<Number> the card codes that can be used to further evaluate the hands
boardCodes
Determines the code for the given hands.
Parameters
board
String the board to convert into card codes, i.e.'Ah Kd Qh'
Returns Array<Number> the card codes that can be used to further evaluate the hands
License
MIT