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Merged
tphummel merged 1 commit into from
Jun 19, 2025
Merged

Expose hands.js as module with cli #22

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8 changes: 8 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,14 @@ Hand: 1
└─────────┴──────┴──────┴─────────┴─────────────┴───────────┴───────┘
```

## use as a module

```js
const simulateHands = require('./hands.js')
const result = simulateHands(1)
console.log(result.sessionSummary)
```

## table rules

`playHand` accepts a `rules` object that controls minimum bets and odds limits.
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284 changes: 148 additions & 136 deletions hands.js
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Original file line number Diff line number Diff line change
@@ -1,158 +1,170 @@
#!/usr/bin/env node
'use strict'

const { playHand } = require('./index.js')
const { minPassLineMaxOddsPlaceSixEight } = require('./betting.js')

const numHands = parseInt(process.argv.slice(2)[0], 10)
const showDetail = process.argv.slice(2)[1]

console.log(`Simulating ${numHands} Craps Hand(s)`)
console.log('Using betting strategy: minPassLineMaxOddsPlaceSixEight')

const summaryTemplate = {
balance: 0,
rollCount: 0,
pointsSet: 0,
pointsWon: 0,
comeOutWins: 0,
comeOutLosses: 0,
netComeOutWins: 0,
neutrals: 0,
placeSixWins: 0,
placeSixLosses: 0,
placeEightWins: 0,
placeEightLosses: 0,
dist: {
2: { ct: 0, prob: 1 / 36 },
3: { ct: 0, prob: 2 / 36 },
4: { ct: 0, prob: 3 / 36 },
5: { ct: 0, prob: 4 / 36 },
6: { ct: 0, prob: 5 / 36 },
7: { ct: 0, prob: 6 / 36 },
8: { ct: 0, prob: 5 / 36 },
9: { ct: 0, prob: 4 / 36 },
10: { ct: 0, prob: 3 / 36 },
11: { ct: 0, prob: 2 / 36 },
12: { ct: 0, prob: 1 / 36 }
}
}

const sessionSummary = Object.assign({}, summaryTemplate)

const hands = []
const rules = {
minBet: 10,
maxOddsMultiple: {
4: 3,
5: 4,
6: 5,
8: 5,
9: 4,
10: 3
function simulateHands (numHands, showDetail) {
const summaryTemplate = {
balance: 0,
rollCount: 0,
pointsSet: 0,
pointsWon: 0,
comeOutWins: 0,
comeOutLosses: 0,
netComeOutWins: 0,
neutrals: 0,
placeSixWins: 0,
placeSixLosses: 0,
placeEightWins: 0,
placeEightLosses: 0,
dist: {
2: { ct: 0, prob: 1 / 36 },
3: { ct: 0, prob: 2 / 36 },
4: { ct: 0, prob: 3 / 36 },
5: { ct: 0, prob: 4 / 36 },
6: { ct: 0, prob: 5 / 36 },
7: { ct: 0, prob: 6 / 36 },
8: { ct: 0, prob: 5 / 36 },
9: { ct: 0, prob: 4 / 36 },
10: { ct: 0, prob: 3 / 36 },
11: { ct: 0, prob: 2 / 36 },
12: { ct: 0, prob: 1 / 36 }
}
}
}

console.log(`[table rules] minimum bet: $${rules.minBet}`)

for (let i = 0; i < numHands; i++) {
if (process.env.DEBUG) {
console.log(`\n================ HAND ${i + 1} ================`)
}
const hand = playHand({ rules, bettingStrategy: minPassLineMaxOddsPlaceSixEight })
hand.summary = Object.assign({}, summaryTemplate)

sessionSummary.balance += hand.balance
hand.summary.balance = hand.balance

hand.history.reduce((memo, roll) => {
memo.rollCount++
hand.summary.rollCount++
memo.dist[roll.diceSum].ct++

switch (roll.result) {
case 'neutral':
memo.neutrals++
hand.summary.neutrals++
break
case 'point set':
memo.pointsSet++
hand.summary.pointsSet++
break
case 'point win':
memo.pointsWon++
hand.summary.pointsWon++
break
case 'comeout win':
memo.comeOutWins++
hand.summary.comeOutWins++
memo.netComeOutWins++
hand.summary.netComeOutWins++
break
case 'comeout loss':
memo.comeOutLosses++
hand.summary.comeOutLosses++
memo.netComeOutWins--
hand.summary.netComeOutWins--
break
const sessionSummary = Object.assign({}, summaryTemplate)
const hands = []
const rules = {
minBet: 10,
maxOddsMultiple: {
4: 3,
5: 4,
6: 5,
8: 5,
9: 4,
10: 3
}
}

if (Array.isArray(roll.payouts)) {
roll.payouts.forEach(p => {
if (p.type === 'place 6 win') {
memo.placeSixWins++
hand.summary.placeSixWins++
} else if (p.type === 'place 8 win') {
memo.placeEightWins++
hand.summary.placeEightWins++
}
})
for (let i = 0; i < numHands; i++) {
if (process.env.DEBUG) {
console.log(`\n================ HAND ${i + 1} ================`)
}
const hand = playHand({ rules, bettingStrategy: minPassLineMaxOddsPlaceSixEight })
hand.summary = Object.assign({}, summaryTemplate)

sessionSummary.balance += hand.balance
hand.summary.balance = hand.balance

hand.history.reduce((memo, roll) => {
memo.rollCount++
hand.summary.rollCount++
memo.dist[roll.diceSum].ct++

switch (roll.result) {
case 'neutral':
memo.neutrals++
hand.summary.neutrals++
break
case 'point set':
memo.pointsSet++
hand.summary.pointsSet++
break
case 'point win':
memo.pointsWon++
hand.summary.pointsWon++
break
case 'comeout win':
memo.comeOutWins++
hand.summary.comeOutWins++
memo.netComeOutWins++
hand.summary.netComeOutWins++
break
case 'comeout loss':
memo.comeOutLosses++
hand.summary.comeOutLosses++
memo.netComeOutWins--
hand.summary.netComeOutWins--
break
}

if (roll.result === 'seven out') {
if (roll.betsBefore?.place?.six) {
memo.placeSixLosses++
hand.summary.placeSixLosses++
if (Array.isArray(roll.payouts)) {
roll.payouts.forEach(p => {
if (p.type === 'place 6 win') {
memo.placeSixWins++
hand.summary.placeSixWins++
} else if (p.type === 'place 8 win') {
memo.placeEightWins++
hand.summary.placeEightWins++
}
})
}
if (roll.betsBefore?.place?.eight) {
memo.placeEightLosses++
hand.summary.placeEightLosses++

if (roll.result === 'seven out') {
if (roll.betsBefore?.place?.six) {
memo.placeSixLosses++
hand.summary.placeSixLosses++
}
if (roll.betsBefore?.place?.eight) {
memo.placeEightLosses++
hand.summary.placeEightLosses++
}
}
}

return memo
}, sessionSummary)
return memo
}, sessionSummary)

hands.push(hand)
}

sessionSummary.handCount = hands.length

for (const k of Object.keys(sessionSummary.dist)) {
sessionSummary.dist[k].ref = Number((sessionSummary.dist[k].prob * sessionSummary.rollCount).toFixed(1))
sessionSummary.dist[k].diff = Number((sessionSummary.dist[k].ct - sessionSummary.dist[k].ref).toFixed(1))
sessionSummary.dist[k].diff_pct = Number((((sessionSummary.dist[k].ct - sessionSummary.dist[k].ref) / sessionSummary.dist[k].ref) * 100).toFixed(1))
if (showDetail) {
sessionSummary.dist[k].ref_work = `${(sessionSummary.dist[k].prob * sessionSummary.rollCount).toFixed(1)} (${sessionSummary.rollCount} * ${sessionSummary.dist[k].prob.toFixed(2)})`
}
delete sessionSummary.dist[k].prob
}

hands.push(hand)
return { sessionSummary, hands, rules }
}

sessionSummary.handCount = hands.length
function printResults ({ sessionSummary, hands, showDetail, rules }) {
console.log(`[table rules] minimum bet: $${rules.minBet}`)

console.log('\nDice Roll Distribution')
console.table(sessionSummary.dist)
delete sessionSummary.dist

console.log('\nSession Summary')
console.table(sessionSummary)

console.log('\nHands Summary')
console.table(hands.map(hand => {
delete hand.summary.dist
return hand.summary
}))

for (const k of Object.keys(sessionSummary.dist)) {
sessionSummary.dist[k].ref = Number((sessionSummary.dist[k].prob * sessionSummary.rollCount).toFixed(1))
sessionSummary.dist[k].diff = Number((sessionSummary.dist[k].ct - sessionSummary.dist[k].ref).toFixed(1))
sessionSummary.dist[k].diff_pct = Number((((sessionSummary.dist[k].ct - sessionSummary.dist[k].ref) / sessionSummary.dist[k].ref) * 100).toFixed(1))
if (showDetail) {
sessionSummary.dist[k].ref_work = `${(sessionSummary.dist[k].prob * sessionSummary.rollCount).toFixed(1)} (${sessionSummary.rollCount} * ${sessionSummary.dist[k].prob.toFixed(2)})`
console.log('\nHands')
hands.forEach((hand, handNum) => {
console.log(`\nHand: ${handNum + 1}, Balance: $${hand.balance}`)
console.table(hand.history)
})
}
delete sessionSummary.dist[k].prob
}
console.log('\nDice Roll Distribution')
console.table(sessionSummary.dist)
delete sessionSummary.dist

console.log('\nSession Summary')
console.table(sessionSummary)

console.log('\nHands Summary')
console.table(hands.map(hand => {
delete hand.summary.dist
return hand.summary
}))

if (showDetail) {
console.log('\nHands')
hands.forEach((hand, handNum) => {
console.log(`\nHand: ${handNum + 1}, Balance: $${hand.balance}`)
console.table(hand.history)
})

if (require.main === module) {
const numHands = parseInt(process.argv[2], 10)
const showDetail = process.argv[3]
console.log(`Simulating ${numHands} Craps Hand(s)`)
console.log('Using betting strategy: minPassLineMaxOddsPlaceSixEight')
const result = simulateHands(numHands, showDetail)
printResults({ ...result, showDetail })
} else {
module.exports = simulateHands
}