commit 2e55d7c3fe74115ae375ab4105133d1aad04c03d
Author: Kozhilya <kozhilya@gmail.com>
Date:   Tue Mar 12 17:28:38 2024 +0400

    Initital commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4926076
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.vscode/
+node_modules/
\ No newline at end of file
diff --git a/Checker.js b/Checker.js
new file mode 100644
index 0000000..8b0bf9b
--- /dev/null
+++ b/Checker.js
@@ -0,0 +1,125 @@
+const { log } = require("console");
+const RollCheck = require("./RollCheck");
+const StatRoll = require("./StatRoll");
+const { stat } = require("fs");
+const ResultStatistics = require("./ResultStatistics");
+
+
+module.exports = class Checker {
+    /**
+     * @type {RollCheck[]}
+     */
+    checks = [];
+
+    /**
+     * @type {int[]}
+     */
+    amounts;
+
+    /**
+     * @type {int}
+     */
+    attemts;
+
+    /**
+     * @type {boolean}
+     */
+    #isPrepared = false;
+
+    /**
+     * @type {ResultStatistics}
+     */
+    statistic_all;
+
+    /**
+     * @type {ResultStatistics}
+     */
+    statistic_passed;
+
+    variants = {};
+
+    full_mask;
+
+    /**
+     * @param {string} name 
+     * @param {(roll: StatRoll) => boolean} fn 
+     */
+    addCheck(name, fn) {
+        if (this.#isPrepared) {
+            console.log("Cannot add check while prepared");
+        }
+
+        this.checks.push(new RollCheck(name, fn));
+    }
+    
+    prepare() {
+        this.amounts = Array.from({length: Math.pow(2, this.checks.length)}, _ => 0);
+        this.#isPrepared = true;
+        this.attemts = 0;
+
+        this.statistic_all = new ResultStatistics();
+        this.statistic_passed = new ResultStatistics();
+    }
+
+    /**
+     * 
+     * @param {StatRoll} statRoll 
+     */
+    test(statRoll) {
+        let mask = 0;
+
+        for (let i = 0; i < this.checks.length; i++) {
+            const check = this.checks[i];
+            const checkResult = check.test(statRoll);
+
+            mask += checkResult ? Math.pow(2, i) : 0;
+        }
+
+        this.amounts[mask] += 1;
+        this.attemts += 1;
+
+        this.statistic_all.add(statRoll);
+
+        if (mask + 1 === this.amounts.length) {
+            this.statistic_passed.add(statRoll);
+        }
+    }
+
+    printResults() {
+        this.statistic_all.print(this.attemts);
+
+        const resultPerCheck = [];
+        for (let i = 0; i < this.checks.length; i++) {
+            const check = this.checks[i];
+            const amount = this.amounts.filter((_, mask) => (mask >> i) % 2 > 0).reduce((a, s) => s + a);
+            
+            resultPerCheck.push({
+                check: check.name,
+                successes: amount,
+                successes_percent: 100 * amount / this.attemts,
+                fails: this.attemts - amount,
+                fails_percent: 100 * (this.attemts - amount) / this.attemts,
+            })
+        }
+        console.table(resultPerCheck);
+
+
+        const result = [];
+
+        for (let mask = 0; mask < this.amounts.length; mask++) {
+            const amount = this.amounts[mask];
+
+            result.push({
+                mask: mask.toString(2),
+                successes: this.checks.filter((_, i) => (mask >> i) % 2 > 0).map(f => f.name).join(', '),
+                fails: this.checks.filter((_, i) => (mask >> i) % 2 === 0).map(f => f.name).join(', '),
+                amount: amount,
+                percent: 100 * amount / this.attemts,
+            });
+        }
+
+        console.table(result);
+
+        this.statistic_passed.print(this.amounts[this.amounts.length - 1]);
+    }
+}
\ No newline at end of file
diff --git a/ResultStatistics.js b/ResultStatistics.js
new file mode 100644
index 0000000..f86a6fc
--- /dev/null
+++ b/ResultStatistics.js
@@ -0,0 +1,94 @@
+const StatRoll = require("./StatRoll");
+const { table } = require('table');
+
+
+module.exports = class ResultStatistics {
+    dices = {};
+    stats = {};
+    counts = {};
+    sums = {};
+
+    constructor() {
+        this.dices = {};
+        this.counts[0] = {};
+        for (let i = 1; i <= 6; i++) {
+            this.dices[i] = 0;
+
+            this.counts[i] = {};
+        }
+
+        this.stats = {};
+        for (let j = 3; j <= 18; j++) {
+            this.stats[j] = 0;
+
+            for (let i = 0; i <= 6; i++) {
+                this.counts[i][j] = 0;
+            }
+        }
+
+        this.sums = {};
+    }
+
+    /**
+     * @param {StatRoll} statRoll 
+     */
+    add(statRoll) {
+        for (let i = 0; i < statRoll.rolls.length; i++) {
+            const stat = statRoll.rolls[i];
+            
+            // this.stats[stat.result] += 1;
+            
+            for (const dice of stat.dices) {
+                this.dices[dice] += 1;
+            }
+        }
+
+        for (let j = 3; j <= 18; j++) {
+            let count = statRoll.rolls.filter(r => r.result === j).length;
+
+            this.counts[count][j] += 1;
+
+            this.stats[j] += count ? 1 : 0;
+        }
+
+        this.sums[statRoll.sum] = (this.sums[statRoll.sum] ?? 0) + 1;
+    }
+
+    print(norm = 1) {
+        const rows = [];
+
+        rows.push([ '', ...Object.keys(this.stats) ]);
+
+        rows.push([ 'Probability', ...Object.values(this.stats).map(v => perc(v, norm)) ]);
+        rows.push([ 'Missing', ...Object.values(this.counts[0]).map(v => perc(v, norm)) ]);
+
+        for (let i = 1; i <= 6; i++) {
+            const counts = this.counts[i];
+
+            rows.push([ i, ...Object.values(this.counts[i]).map(v => perc(v, norm)) ]);
+        }
+
+        console.log(table(rows, { 
+            drawHorizontalLine: (i, rc) => [0, 1, 3, rc].indexOf(i) >= 0,
+        }));
+
+
+        const sums = {};
+        const spl = 5;
+        const from = Math.floor(Object.keys(this.sums).reduce((a, m) => Math.min(a, m)) / spl);
+        const to   = Math.floor(Object.keys(this.sums).reduce((a, m) => Math.max(a, m)) / spl);
+
+        for (let i = from; i <= to; i++) {
+            const min = spl * i, max = spl * (i + 1) - 1;
+            const f = Object.entries(this.sums).filter(([sum, _]) => (sum >= min) && (sum <= max));
+            sums[`${min}-${max}`] = perc(f.length ? f.map(([_, count]) => count).reduce((count, sum) => sum + count) : 0, norm); 
+        }
+
+        console.log(table([ Object.keys(sums), Object.values(sums) ]))
+    }
+
+}
+
+function perc(a, N) {
+    return (a == 0) ? '' : `${(100 * a / N).toLocaleString('ru-RU', { maximumFractionDigits: 2, minimumFractionDigits: 2 })}%`;
+}
\ No newline at end of file
diff --git a/RollCheck.js b/RollCheck.js
new file mode 100644
index 0000000..71e5ac1
--- /dev/null
+++ b/RollCheck.js
@@ -0,0 +1,18 @@
+const StatRoll = require("./StatRoll");
+
+module.exports = class RollCheck {
+    name;
+    fn;
+
+    constructor(name, fn) {
+        this.name = name;
+        this.fn = fn;
+    }
+
+    /**
+     * @param {StatRoll} statRoll 
+     */
+    test(statRoll) {
+        return this.fn(statRoll);
+    }
+}
\ No newline at end of file
diff --git a/Stat.js b/Stat.js
new file mode 100644
index 0000000..de8a309
--- /dev/null
+++ b/Stat.js
@@ -0,0 +1,38 @@
+'use strict';
+
+const Chance = require("chance");
+
+module.exports = class Stat {
+    /**
+     * @type {number{4}}
+     */
+    dices;
+
+    /**
+     * @type {number}
+     */
+    result
+
+    constructor(diceString) {
+        this.dices = Stat.chance(diceString);
+        // this.dices = Array.from({length: 4}, _ => Math.floor(Math.random() * 6 + 1));
+
+        this.dices.sort().reverse();
+
+        this.result = this.dices.reduce((a, s) => s + a, 0) - Math.min(...this.dices);
+    }
+
+    toString() {
+        return `${this.result} [${this.dices.join(',')}]`;
+    }
+
+    static #chance;
+
+    static chance(diceString) {
+        if (!this.#chance) {
+            this.#chance = new Chance();
+        }
+
+        return this.#chance.rpg(diceString);
+    }
+}
\ No newline at end of file
diff --git a/StatRoll.js b/StatRoll.js
new file mode 100644
index 0000000..150e8fb
--- /dev/null
+++ b/StatRoll.js
@@ -0,0 +1,33 @@
+'use strict';
+
+const Stat = require("./Stat.js");
+
+module.exports = class StatRoll {
+    /**
+     * @prop {Stat[6]} rolls
+     */
+    rolls;
+
+    /**
+     * @prop {number} sum
+     */
+    sum;
+
+    constructor(rolls) {
+        this.rolls = Array.from({length: 6}, _ => new Stat("4d6"));
+
+        this.rolls.sort((r1, r2) => r1.result - r2.result).reverse();
+
+        this.sum = this.rolls.map(r => r.result).reduce((r, s) => s += r);
+    }
+    
+    
+    toString() {
+        return `{${this.rolls.join(' / ')}}`;
+    }
+
+
+    toShortString() {
+        return `{${this.rolls.map(r => r.result).join('/')}}`;
+    }
+}
\ No newline at end of file
diff --git a/main.js b/main.js
new file mode 100644
index 0000000..e72d129
--- /dev/null
+++ b/main.js
@@ -0,0 +1,33 @@
+'use strict';
+
+const Checker = require("./Checker.js");
+const StatRoll = require("./StatRoll.js");
+const ProgressBar = require('progress');
+
+const checker = new Checker();
+
+checker.addCheck("min70", roll => roll.sum >= 70);
+checker.addCheck("lows",  roll => roll.rolls.filter(r => r.result <  10).length <  2);
+checker.addCheck("highs", roll => roll.rolls.filter(r => r.result >= 15).length >= 2);
+
+checker.prepare();
+
+
+const N = 1000000;
+// const N = 10;
+
+const bar = new ProgressBar('[:bar] :rate/bps :percent :etas', { total: N });
+
+for (let i = 0; i < N; i++) {
+    const roll = new StatRoll();
+
+    checker.test(roll);
+
+    bar.tick();
+
+    // console.log(roll.toString());
+}
+
+// console.log(checker);
+
+checker.printResults();
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..c18e654
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,199 @@
+{
+  "name": "dnd_stat_roll_distribution",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "dnd_stat_roll_distribution",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "chance": "^1.1.11",
+        "progress": "^2.0.3",
+        "table": "^6.8.1"
+      }
+    },
+    "node_modules/ajv": {
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+        "json-schema-traverse": "^1.0.0",
+        "require-from-string": "^2.0.2",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
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+        "astral-regex": "^2.0.0",
+        "is-fullwidth-code-point": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/slice-ansi?sponsor=1"
+      }
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+      "dependencies": {
+        "ajv": "^8.0.1",
+        "lodash.truncate": "^4.4.2",
+        "slice-ansi": "^4.0.0",
+        "string-width": "^4.2.3",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
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+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..686f9cf
--- /dev/null
+++ b/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "dnd_stat_roll_distribution",
+  "version": "1.0.0",
+  "description": "",
+  "main": "main.js",
+  "scripts": {
+    "main": "node main.js"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "chance": "^1.1.11",
+    "progress": "^2.0.3",
+    "table": "^6.8.1"
+  }
+}