day 2

2022/2.js

@@ -0,0 +1,43 @@
+const fs = require('fs');
+
+const action = { A: 0, B: 1, C: 2 };
+const result = { L: 0, D: 3, W: 6 };
+const matrix = [[result.D, result.W, result.L],
+                [result.L, result.D, result.W],
+                [result.W, result.L, result.D]]
+
+const evalMove = (move) => {
+    const theirMove = action[move[0]];
+    const myMove = action[String.fromCharCode(move[1].charCodeAt(0) - 23)];
+    return matrix[theirMove][myMove];
+}
+
+const moves = fs.readFileSync('2.input').toString().split('\n').map(v => v.split(' '));
+
+const scorePot = moves.reduce((p, c, i) => { 
+    p += action[String.fromCharCode(c[1].charCodeAt(0) - 23)] + 1;
+    p += evalMove(c);
+    return p;
+}, 0);
+
+console.log(`Part 1: ${scorePot}`);
+
+const expected = { X: 0, Y: 3, Z: 6 };
+
+const evalTarget = (move) => {
+    const targetResult = expected[move[1]];
+    for (let x = 0; x < 3; x++) {
+        const char = String.fromCharCode(88 + x);
+        if (evalMove([move[0], char]) == targetResult) {
+            return action[String.fromCharCode(65 + x)] + 1;
+        }
+    }
+}
+
+const targetResolutionScorePot = moves.reduce((p, c, i) => {
+    p += expected[c[1]];
+    p += evalTarget(c);
+    return p;
+}, 0)
+
+console.log(`Part 2: ${targetResolutionScorePot}`);