From https://codesandbox.io/s/poker-m6olm?file=/src/index.js:0-2400
Use for texas poker
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March 16, 2021 15:04
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how the texas poker win or not
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| import "./styles.css" | |
| function PokerHand(hand) { | |
| this.hand = hand | |
| } | |
| PokerHand.prototype.compareWith = function(hand) { | |
| return compareHands(this.hand, hand.hand || hand) | |
| } | |
| const order = "23456789TJQKA" | |
| function getHandDetails(hand) { | |
| const cards = hand.split(" ") | |
| const faces = cards.map(a => String.fromCharCode([77 - order.indexOf(a[0])])).sort() | |
| const suits = cards.map(a => a[1]).sort() | |
| const counts = faces.reduce(count, {}) | |
| const duplicates = Object.values(counts).reduce(count, {}) | |
| const flush = suits[0] === suits[4] | |
| const first = faces[0].charCodeAt(0) | |
| //Also handle low straight | |
| const lowStraight = faces.join("") === "AJKLM" | |
| faces[0] = lowStraight ? "N" : faces[0] | |
| const straight = lowStraight || faces.every((f, index) => f.charCodeAt(0) - first === index) | |
| let rank = | |
| (flush && straight && 1) || | |
| (duplicates[4] && 2) || | |
| (duplicates[3] && duplicates[2] && 3) || | |
| (flush && 4) || | |
| (straight && 5) || | |
| (duplicates[3] && 6) || | |
| (duplicates[2] > 1 && 7) || | |
| (duplicates[2] && 8) || | |
| 9 | |
| return { rank, value: faces.sort(byCountFirst).join("") } | |
| function byCountFirst(a, b) { | |
| //Counts are in reverse order - bigger is better | |
| const countDiff = counts[b] - counts[a] | |
| if (countDiff) return countDiff // If counts don't match return | |
| return b > a ? -1 : b === a ? 0 : 1 | |
| } | |
| function count(c, a) { | |
| c[a] = (c[a] || 0) + 1 | |
| return c | |
| } | |
| } | |
| function compareHands(h1, h2) { | |
| let d1 = getHandDetails(h1) | |
| let d2 = getHandDetails(h2) | |
| if (d1.rank === d2.rank) { | |
| if (d1.value < d2.value) { | |
| return "WIN" | |
| } else if (d1.value > d2.value) { | |
| return "LOSE" | |
| } else { | |
| return "DRAW" | |
| } | |
| } | |
| return d1.rank < d2.rank ? "WIN" : "LOSE" | |
| } | |
| function test(h1, h2) { | |
| document.getElementById("app").innerHTML += `<div> ${h1} <em>against</em> ${h2} - ${compareHands(h1, h2)}</div>` | |
| } | |
| test("AH 2H 3H 4H 5H", "AS AD AC AH JD") | |
| test("AH 2H 3H 4H 5H", "2C 3C 4C 5C 6C") | |
| test("AH KH QH JH TH", "KC QC JC TC 9C") | |
| test("2H 3H 4H 5H 6H", "KS AS TS QS JS") | |
| test("2H 3H 5H 6H 7H", "2S 3H 4H 5S 6C") | |
| test("2S 3H 4H 5S 6C", "3D 4C 5H 6H 2S") | |
| test("2S AH 4H 5S KC", "AH AC 5H 6H 7S") | |
| test("3S 3H 3C AD AH", "4H 4C 4S 2H 2S") | |
| test("3S 3H 3C AD AH", "4H 4C 4S 2H 2S") |
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