day 2

day_2/task_1.js

@@ -0,0 +1,31 @@
+const fs = require('fs');
+const file = fs.readFileSync('./input.txt').toString('utf-8');
+const arr = file.split('\n');
+
+let invalid = []
+
+arr.forEach(item => {
+    // Split the puzzle input
+    let split = item.split(": ");
+    let pw = split[1];
+    
+    split = split[0].split(" ");
+    let wantedLetter = split[1];
+    
+    split = split[0].split("-");
+    let [lowerNum, upperNum] = split;
+    
+    // Check if the password is valid
+    let count = 0;
+    for (let letter of pw) {
+        if (letter == wantedLetter) count++;
+    }
+    
+    if (count < lowerNum || count > upperNum) {
+        invalid.push(pw);
+    }
+});
+
+console.log(`Total:   ${arr.length}`);
+console.log(`Invalid: ${invalid.length}`);
+console.log(`Valid:   ${arr.length - invalid.length}`);

day_2/task_2.js

@@ -0,0 +1,26 @@
+const fs = require('fs');
+const file = fs.readFileSync('./input.txt').toString('utf-8');
+const arr = file.split('\n');
+
+let invalid = []
+
+arr.forEach(item => {
+    // Split the puzzle input
+    let split = item.split(": ");
+    let pw = split[1];
+    
+    split = split[0].split(" ");
+    let wantedLetter = split[1];
+    
+    split = split[0].split("-");
+    let [firstPos, secondPos] = split;
+    
+    // Check if the password is valid
+    if (!(pw.charAt(Number(firstPos) - 1) == wantedLetter ^ pw.charAt(Number(secondPos) - 1) == wantedLetter)) {
+        invalid.push(pw);
+    }
+});
+
+console.log(`Total:   ${arr.length}`);
+console.log(`Invalid: ${invalid.length}`);
+console.log(`Valid:   ${arr.length - invalid.length}`);