day 3 part 2 init

solutions/03.ts

@@ -7,21 +7,47 @@ import { readInput } from "../utils.ts";
 class DayThree implements Solvable {
     input = readInput('03')
 
+    private multiplyInstruction(inst: string) {
+        return inst
+            .slice(4, -1)
+            .split(',')
+            .map(arr => Number.parseInt(arr))
+    }
+
+
     public part1(): Solvable {
         const re = /mul\([0-9]+,[0-9]+\)/g
         // get all matches and parse them to int[]
         const result = this.input.matchAll(new RegExp(re))
-            .map(match => match[0]
-                .slice(4, -1)
-                .split(',')
-                .map(arr => Number.parseInt(arr)))
+            .map(match => this.multiplyInstruction(match[0]))
             .map(([left, right]) => left * right)
             .reduce((prev, curr) => prev + curr)
             console.log(result)
             return this
     }
+
     public part2(): Solvable {
-      return this
+        const re = /(mul\([0-9]+,[0-9]+\)|do\(\)|don\'t\(\))/g
+        // get all matches and parse them to int[]
+        const instructions = this.input.matchAll(new RegExp(re)).map(match => match[0])
+        let active = true
+        let result = 0
+        for (const inst of instructions) {
+            if (inst === 'do()') {
+                active = true;
+                continue
+            }
+            if (inst === 'don\'t()') {
+                active = false;
+                continue 
+            }
+            if (active) {
+                const [left, right] = this.multiplyInstruction(inst)
+                result += left * right
+            }
+        }
+        console.log(result)
+        return this
     }
 }