The monkeys are back! You're worried they're going to try to steal your stuff again, but it seems like they're just holding their ground and making various monkey noises at you. Eventually, one of the elephants realizes you don't speak monkey and comes over to interpret. As it turns out, they overheard you talking about trying to find the grove;…

adventofcode_com_2022_day_21_part1.js

//
// https://adventofcode.com/2022/day/21
//
// Author: @greenido
// Date: 21-Dec-2022
//
const fs = require('fs')
const monkeys = new Map();

//
// Get the number that the monkey will yell
// Go deeper if the current monkey is holding a dependecy on two other dudes.
//
function getNumber(monkeyName, monkeyOp) {
  if (isNaN(monkeyOp)) {
    // It depnds on two other monkeys
    let num1 = getNumber(monkeyOp.name1, monkeys.get(monkeyOp.name1));
    let op = monkeyOp.op;
    let num2 = getNumber(monkeyOp.name2, monkeys.get(monkeyOp.name2));
    let res = 0;
    if (op == '+') {
      res = num1 + num2;
    }
    else if (op == '-') {
      res = num1 - num2;
    }
    else if (op == '/') {
      res = num1 / num2;
    }
    else if (op == '*') {
      res = num1 * num2;
    }
    console.log(monkeyName + " return: " + res);
    return res;
  }
  else {
    // The monkey just yell the number
    console.log(monkeyName + " return num: " + monkeyOp);
    return monkeyOp;
  }
}

//
// Start the party 📃
//
try {
  // read contents of the file
  const data = fs.readFileSync('/Applications/MAMP/htdocs/adventofcode/day_21/data21.txt', 'UTF-8');
  
  // unit test data
  //const data = fs.readFileSync('/Applications/MAMP/htdocs/adventofcode/day_21/unit-test-data21.txt', 'UTF-8');
  
  // split the contents by new line
  const lines = data.split(/\r?\n/);
  let totalScore = 0;


  lines.forEach(line => {
    let curInput = line.split(' ').map(element => element.trim());
    let monkeyName = curInput[0].replace(":", "");
    if (!isNaN(curInput[1])) {
      monkeys.set(monkeyName, parseInt(curInput[1]));
    }
    else {
      let moneyAction = {
        name1: curInput[1],
        op: curInput[2],
        name2: curInput[3]
      }
      monkeys.set(monkeyName, moneyAction);
    }
  });
  //console.log(monkeys);
  
  totalScore = getNumber('root' , monkeys.get("root"));
  console.log("🌅🌅🌅 Total : " + totalScore);
}
catch (err) {
  console.error(err);
}