adding Day 1 JS solution

Day01/js/solution.js

@@ -0,0 +1,74 @@
+const fs = require('fs');
+
+function extractDigits(line) {
+    // Mapping of digit words to their numeric values
+    const digitMap = {
+        zero: 0, one: 1, two: 2, three: 3, four: 4,
+        five: 5, six: 6, seven: 7, eight: 8, nine: 9
+    };
+
+    // Add single digit mappings
+    for (let i = 0; i <= 9; i++) {
+        digitMap[i.toString()] = i;
+    }
+
+    let digitsFound = [];
+    let i = 0;
+    while (i < line.length) {
+        let matched = false;
+        for (const [word, digit] of Object.entries(digitMap)) {
+            if (line.startsWith(word, i)) {
+                digitsFound.push(digit);
+                i += word.length - 1; // Advance the index
+                matched = true;
+                break;
+            }
+        }
+        i++; // Move to the next character if no match
+    }
+
+    return digitsFound;
+}
+
+function extractCalibrationValue(line) {
+    const digits = extractDigits(line);
+    if (digits.length > 0) {
+        return parseInt(`${digits[0]}${digits[digits.length - 1]}`, 10);
+    }
+    return 0;
+}
+
+function calculateTotalCalibrationValue(filePath) {
+    const lines = fs.readFileSync(filePath, 'utf-8').split('\n');
+    return lines.reduce((sum, line) => sum + extractCalibrationValue(line), 0);
+}
+
+// Run the test
+function test() {
+    console.warn("Starting Tests")
+    const testLines = [
+        "two1nine",
+        "eightwothree",
+        "abcone2threexyz",
+        "xtwone3four",
+        "4nineeightseven2",
+        "zoneight234",
+        "7pqrstsixteen"
+    ];
+    const expectedResults = [29, 83, 13, 24, 42, 14, 76];
+
+    testLines.forEach((line, index) => {
+        const result = extractCalibrationValue(line);
+        console.assert(result === expectedResults[index], `Error in line '${line}': Expected ${expectedResults[index]}, got ${result}`);
+        console.log(`Line: '${line}', Calibration Value: ${result}`);
+    });
+    console.log("Finished Tests\n")
+}
+
+// Run the test function for verification
+test();
+
+// Calculate and print the total calibration value
+const totalValue = calculateTotalCalibrationValue('../input.txt');
+console.log(`Total Calibration Value from input.txt: ${totalValue}`);
+