solve Day06 in JS

Day06/js/solution.js

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+const fs = require('fs');
+const assert = require('assert');
+
+/**
+ * Parses the input file to extract the race time and record distance.
+ * @param {string} file_path - Path to the input file.
+ * @returns {Object} - An object containing time and record distance.
+ */
+function parseInput(file_path) {
+    try {
+        const lines = fs.readFileSync(file_path, 'utf-8').trim().split('\n');
+        const time = parseInt(lines[0].replace(/\D/g, ''), 10);
+        const distance = parseInt(lines[1].replace(/\D/g, ''), 10);
+        console.log(`Parsed input from ${file_path} - Time: ${time}, Distance: ${distance}`);
+        return { time, distance };
+    } catch (error) {
+        throw new Error(`Error parsing input file: ${error.message}`);
+    }
+}
+
+/**
+ * Calculates the number of ways to beat the record for the race.
+ * @param {number} time - Total time for the race.
+ * @param {number} record - Record distance to beat.
+ * @returns {number} - Number of ways to win the race.
+ */
+function calculateWinningWays(time, record) {
+    console.log(`Calculating winning ways for Time: ${time}, Record: ${record}`);
+    let minHoldTime = 0;
+    while (minHoldTime * (time - minHoldTime) <= record && minHoldTime < time) {
+        minHoldTime++;
+    }
+    let maxHoldTime = time - 1;
+    while (maxHoldTime * (time - maxHoldTime) <= record && maxHoldTime >= 0) {
+        maxHoldTime--;
+    }
+    const winningWays = Math.max(0, maxHoldTime - minHoldTime + 1);
+    console.log(`Winning ways calculated: ${winningWays} (Min: ${minHoldTime}, Max: ${maxHoldTime})`);
+    return winningWays;
+}
+
+/**
+ * Runs a test with the given file and compares the result to the expected result.
+ * @param {string} file_path - Path to the test file.
+ * @param {number} expected_result - Expected result for the test.
+ */
+function runTest(file_path, expected_result) {
+    console.log(`Running test with file: ${file_path}`);
+    const { time, distance } = parseInput(file_path);
+    const result = calculateWinningWays(time, distance);
+    assert.strictEqual(result, expected_result, `Test failed! Expected ${expected_result}, got ${result}`);
+    console.log("Test passed successfully.");
+}
+
+function main() {
+    try {
+        // Run the test
+        const testFilePath = "../test.txt";
+        const expectedTestResult = 71503; // Expected result from the test file
+        runTest(testFilePath, expectedTestResult);
+
+        // Process the actual input
+        const inputFilePath = "../input.txt";
+        console.log(`\nProcessing input file: ${inputFilePath}`);
+        const { time, distance } = parseInput(inputFilePath);
+        const result = calculateWinningWays(time, distance);
+        console.log(`Final result from input file: ${result}`);
+
+    } catch (error) {
+        console.error(`An error occurred: ${error.message}`);
+    }
+}
+
+main();