dice-simulation.js

// Generate random dice rolls for each number of dice
const generateDiceRolls = (numDice) => {
    const diceRolls = [];
    for (let i = 0; i < numDice; i++) {
        const currentRoll = Math.floor(Math.random() * 6) + 1;
        diceRolls.push(currentRoll);
    }
    return diceRolls;
}

// Calculate the total score from one game with a specified number of dice
const calculateTotalScore = (numDice) => {
    let totalScore = 0;
    let diceRolls = generateDiceRolls(numDice);

    // Keep rolling until all dice are removed based on constraints
    while (diceRolls.length > 0) {
        if (diceRolls.some(die => die === 3)) {
            totalScore += 0; // just to be explicit
            diceRolls = diceRolls.filter(die => die !== 3);
        } else {
            const lowestDieRoll = Math.min(...diceRolls);
            totalScore += lowestDieRoll;
            const diceIndexToRemove = diceRolls.indexOf(lowestDieRoll);
            diceRolls.splice(diceIndexToRemove, 1);
        }
        if (diceRolls.length > 0) {
            diceRolls = generateDiceRolls(diceRolls.length);
        }
    }
    return totalScore;
}

// Simulate the dice game for a specific number of simulations and dice available
const simulateDiceGame = (numDice, numSimulations) => {
    const scoreCounts = {};
    const startTime = Date.now();

    for (let i = 0; i < numSimulations; i++) {
        const score = calculateTotalScore(numDice);
        scoreCounts[score] = (scoreCounts[score] || 0) + 1;
    }

    const endTime = Date.now();
    const totalTime = (endTime - startTime) / 1000;

    console.log(`Number of simulations was ${numSimulations} using ${numDice} dice.`);

    for (const [score, count] of Object.entries(scoreCounts)) {
        const occurrenceRate = (count / numSimulations).toFixed(2);
        console.log(`Total ${score} occurs ${occurrenceRate} occurred ${count} times.`);
    }
    console.log(`Total simulation took ${totalTime} seconds.`);
};

// You can run this with node dice-simulation.js <numDice> <numSimulations>
// For example: node dice-simulation.js 5 10000
// Otherwise it defaults to 5 dice and 10000 simulations
simulateDiceGame(process.argv[2] || 5, process.argv[3] || 10000);