11 part 1

2022/11.input

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+Monkey 0:
+  Starting items: 79, 98
+  Operation: new = old * 19
+  Test: divisible by 23
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 54, 65, 75, 74
+  Operation: new = old + 6
+  Test: divisible by 19
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 79, 60, 97
+  Operation: new = old * old
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 74
+  Operation: new = old + 3
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 1

2022/11.js

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+const fs = require('fs');
+const { default: test } = require('node:test');
+
+const monkeys = [];
+
+// parse monkeys
+const parseMonkeys = (monkeyString) => {
+    const lines = monkeyString.split('\n');
+    const startingItems = lines[1].split(':')[1].split(',').map(x => BigInt(x));
+    const op = lines[2].split('new = ')[1].split('');
+    const test = { 
+        divis: parseInt(lines[3].split('by ')[1]),
+        pass: parseInt(lines[4].split('monkey')[1]),
+        fail: parseInt(lines[5].split('monkey')[1]),
+    };
+
+    monkeys.push({
+        inventory: startingItems,
+        operation: op,
+        test: test,
+        inspections: 0,
+    });
+}
+
+const input = fs.readFileSync('11.input').toString().split('\n\n');
+for (const monkey of input) parseMonkeys(monkey);
+
+for (let round = 0; round < 10000; round++) {
+    for (let i in monkeys) {
+        const monkey = monkeys[i];
+
+        for (let j in monkey.inventory) {
+            const item = monkey.inventory[j];
+            monkey.inspections++;
+
+            const old = item; // for eval
+            let newWorry = Math.floor(eval(monkey.operation));
+            if (newWorry % monkey.test.divis === 0) {
+                monkeys[monkey.test.pass].inventory.push(newWorry);
+            } else {
+                monkeys[monkey.test.fail].inventory.push(newWorry);
+            }
+        }
+        monkey.inventory = [];
+    }
+}
+
+console.log(monkeys);
+console.log(`Part 1: ${monkeys.sort((a, b) => b.inspections - a.inspections)[0].inspections * monkeys.sort((a, b) => b.inspections - a.inspections)[1].inspections}`);