@tanndev/maelstrom/test/roll_test.js

Rules and resources for Maelstrom RPG.

/*
 * Copyright (c) 2018 James Tanner
 */

const Roll = require('../classes/Roll');

const REPEAT = 1000000;

const difficulty = 6;
const threshold = 0;
const specialty = true;

console.log(`\nRepeating each roll ${REPEAT} times.`);
for (let pool = 1; pool <= 7; pool++){
    let successCount = 0;
    let successTotal = 0;
    let failureCount = 0;
    let botchCount = 0;
    let results = [];
    for (let i = 0; i < REPEAT; i++){
        let roll = new Roll(pool, {difficulty, threshold, specialty});
        if (roll.succeeded){
            successCount++;
            successTotal += roll.result;
        }
        else if (roll.failed) failureCount++;
        else if (roll.botched) botchCount++;
        else throw new Error("How did it neither succeed, nor fail, nor botch?");
        results.push(roll.result);
    }

    let averageSuccessesTotal = (successTotal / REPEAT).toFixed(1);
    let averageSuccessesOnSuccess = (successTotal / successCount).toFixed(1);
    let successPercent = (successCount / REPEAT * 100).toFixed(1);
    let failurePercent = (failureCount / REPEAT * 100).toFixed(1);
    let botchPercent = (botchCount / REPEAT * 100).toFixed(1);

    let output = [''];
    output.push(`Pool: ${pool}, Difficulty: ${difficulty}, Threshold: ${threshold}, ${specialty ? 'With' : 'Without'} Specialty:`);
    output.push(`\tAverage Successes: ${averageSuccessesTotal}`);
    output.push(`\tSuccess Rate: ${successPercent}% (${successCount}) (Avg. ${averageSuccessesOnSuccess})`);
    output.push(`\tFailure Rate: ${failurePercent}% (${failureCount})`);
    output.push(`\tBotch Rate: ${botchPercent}% (${botchCount})`);
    console.log(output.join('\n'));
}