High-performance poker hand evaluator optimized for browser environments, using bitwise operations for rapid poker hand analysis and equity calculations.
npm install poker-bitvaljsHigh-performance poker hand evaluator optimized for browser environments, using bitwise operations for rapid poker hand analysis and equity calculations.
🌐 Try it online - Range vs Range Evaluator
- Fast hand evaluation using bitwise operations
- Range vs range equity calculations with canonical key caching optimization
- Web Workers support for parallel processing across multiple CPU cores (3-7x speedup)
- Monte Carlo simulation for preflop and postflop scenarios
- Exhaustive enumeration for flop/turn scenarios (2 or fewer cards to come)
- Progress callbacks with configurable update intervals
- Browser and Node.js compatible
``bash`
npm install poker-bitvaljs
`javascript
const BitVal = require('poker-bitvaljs');
const bitval = new BitVal();
// Evaluate a hand (7 cards: 2 hole cards + 5 board cards)
const handMask = bitval.getBitMasked(['As', 'Ah', 'Ks', 'Qs', 'Js', 'Ts', '9s']);
const [evaluation, kickers] = bitval.evaluate(handMask);
// Returns [evaluation_score, kickers]
// Higher evaluation score = stronger hand
`
`javascript
const BitVal = require('poker-bitvaljs');
const bitval = new BitVal();
// Compare two ranges
const heroHands = ['AsAh', 'AsAd', 'AsAc', 'AhAd', 'AhAc', 'AdAc']; // All AA combinations
const villainHands = ['KsKh', 'KsKd', 'KsKc', 'KhKd', 'KhKc', 'KdKc']; // All KK combinations
const result = await bitval.compareRange(
heroHands,
villainHands,
[], // board cards (empty for preflop)
[], // dead cards
5, // number of board cards
10000, // iterations
true, // optimize (use canonical caching)
null, // progress callback (optional)
100, // progress interval (optional, default: 100)
true // use workers (optional, default: true)
);
// Result: { win: 8120, tie: 30, lose: 1850 }
// Calculate equity: (win + tie/2) / (win + tie + lose) * 100
`
`javascript${Math.round((current/total)*100)}% - ${message}
const result = await bitval.compareRange(
heroHands,
villainHands,
[],
[],
5,
100000,
true,
(current, total, message) => {
console.log();`
},
100, // Update progress every 100 matchups
true // Use Web Workers for parallelization
);
`javascript`
// Disable Web Workers (useful for debugging or when workers aren't supported)
const result = await bitval.compareRange(
heroHands,
villainHands,
[],
[],
5,
10000,
true,
null,
100,
false // Disable Web Workers, use sequential execution
);
`javascript`
// Compare ranges on a flop
const boardCards = ['As', 'Ks', 'Qs'];
const result = await bitval.compareRange(
heroHands,
villainHands,
boardCards,
[],
5,
10000,
true
);
Creates a new BitVal instance.
Evaluates a poker hand represented as a BigInt bitmask.
Parameters:
- handMask (BigInt): Bitmask representing 5-7 cards
Returns:
- [evaluation, kickers] (Array): Evaluation score and kicker bits
Converts an array of card strings to a BigInt bitmask.
Parameters:
- cards (Array): Array of card strings (e.g., ['As', 'Kh', 'Qd'])
Returns:
- BigInt: Bitmask representing the cards
Simulates a single hand vs hand matchup.
Parameters:
- iterations (Number): Number of simulationsnumberOfBoardCards
- (Number): Total board cards (default: 5)hero
- (Array): Hero's hole cards as bitmaskvillain
- (Array): Villain's hole cards as bitmaskboard
- (Array): Board cards as bitmaskdeadCards
- (Array): Dead cards as bitmask
Returns:
- { win, tie, lose }: Results object
Compares two ranges of hands with optional optimization and Web Workers parallelization.
Parameters:
- heroHands (Array): Array of hero hand strings (e.g., ['AsAh', 'AsAd'])villainHands
- (Array): Array of villain hand stringsboardCards
- (Array): Board cards as strings (default: [])deadCards
- (Array): Dead cards as strings (default: [])numberOfBoardCards
- (Number): Total board cards (default: 5)iterations
- (Number): Number of simulations per matchup (default: 10000)optimize
- (Boolean): Use canonical key caching for performance (default: true). Note: Optimizations may result in a ±0.5% margin of error compared to unoptimized calculations.progressCallback
- (Function): Optional callback (current, total, message) => {} (default: null)progressInterval
- (Number): Update progress callback every N matchups (default: 100)useWorkers
- (Boolean): Use Web Workers for parallelization across CPU cores (default: true). Automatically falls back to sequential execution if workers are unavailable or workload is too small (< 4 matchups).
Returns:
- Promise<{ win, tie, lose }>: Results object
Web Workers Notes:
- Web Workers provide 3-7x speedup on multi-core systems by parallelizing matchup evaluations
- Workers are automatically disabled when:
- useWorkers is falsefile://
- Workers are not supported by the browser
- There are fewer than 4 matchups (overhead not worth it)
- For local testing with protocol, use a local web server (see Testing Locally)
- Optimized for browser environments with efficient bitwise operations
- Web Workers parallelization provides 3-7x speedup on multi-core systems
- Canonical key caching reduces redundant evaluations (may introduce ±0.5% margin of error)
- Exhaustive enumeration for flop/turn (2 or fewer cards to come)
- Monte Carlo simulation for preflop and river scenarios
- Adaptive progress reporting to minimize UI blocking
Test performance and benchmark online: https://darraghgeo.github.io/poker-bitvaljs/
- Enable Web Workers (default) for best performance on multi-core systems
- Use canonical caching (optimize: true) for large range comparisonsprogressInterval
- Adjust to balance UI responsiveness vs. performance
- For very small workloads (< 4 matchups), workers are automatically disabled to avoid overhead
When testing locally, Web Workers require a proper HTTP origin. If you open index.html directly from the file system (file:// protocol), workers will fail with a SecurityError.
Solution: Use a local web server
`bashPython 3
python3 -m http.server 8000
Then open
http://localhost:8000` in your browser. The application will automatically fall back to sequential execution if workers are unavailable.MIT
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