2020-14 part 2 in javascript

2020/14-Docking_Data/.eslintrc.json

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+{
+	"env": {
+		"es2021": true,
+		"node": true
+	},
+	"extends": [
+		"eslint:recommended",
+		"plugin:node/recommended"
+	],
+	"overrides": [
+		{
+			"files": ["*.js"],
+			"rules": {
+				"no-constant-condition": "off"
+			}
+		}
+	],
+	"parserOptions": {
+		"ecmaVersion": "latest",
+		"sourceType": "module"
+	},
+	"rules": {
+		"indent": [
+			"error",
+			"tab"
+		],
+		"linebreak-style": [
+			"error",
+			"unix"
+		],
+		"quotes": [
+			"error",
+			"single"
+		],
+		"semi": [
+			"error",
+			"always"
+		],
+		"node/no-unsupported-features/es-syntax": [
+			"error",
+			{ "ignores": ["modules"] }
+		]
+	}
+}

2020/14-Docking_Data/package.json

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+{
+	"type": "module",
+	"engines": {
+		"node": ">=18.10.0"
+	},
+	"dependencies": {
+		"eslint": "^8.30.0",
+		"eslint-plugin-node": "^11.1.0",
+		"jslint": "^0.12.1"
+	}
+}

2020/14-Docking_Data/second.js

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+import * as fs from 'fs';
+
+const setMask = /mask = ([10X]+)/;
+const operation = /mem\[(\d+)] = (\d+)/;
+
+function applyMask(addr, mask) {
+	let ret = [parseInt(addr).toString(2).padStart(36, '0')];
+	for (let i=0; i<36; ++i) {
+		switch (mask.charAt(i)) {
+		case '1':
+			ret = ret.map(a => a.substring(0, i) + '1' + a.substring(i+1));
+			break;
+		case 'X':
+			ret = ret.reduce((acc, a) => acc.concat([
+				a.substring(0, i) + '1' + a.substring(i+1),
+				a.substring(0, i) + '0' + a.substring(i+1),
+			]), []);
+		}
+	}
+	return ret.map(a => parseInt(a, 2));
+}
+
+function processMasks(lines) {
+	let ret = new Map();
+	let mask = '';
+	lines.forEach(line => {
+		const m = line.match(setMask);
+		if (m) {
+			mask = m[1];
+		} else {
+			const o = line.match(operation);
+			const addr = o[1];
+			const value = parseInt(o[2]);
+			applyMask(addr, mask).forEach(r => ret.set(parseInt(r), value));
+		}
+	});
+	return ret;
+}
+
+function load(filename) {
+	return processMasks(fs.readFileSync(filename, 'utf8')
+		.trim()
+		.split('\n')
+	);
+}
+
+let example = load('example2');
+let input = load('input');
+
+function solve(input) {
+	let sum = 0;
+	input.forEach(value => sum += value);
+	return sum;
+}
+
+const exampleOutput = solve(example);
+if (exampleOutput !== 208) {
+	console.log('Example failed with ' + exampleOutput);
+	process.exit(1); // eslint-disable-line
+}
+
+console.log(solve(input));