aoc/2024/03/p1/index.js

const fs = require('node:fs');
const readline = require('readline');

async function processLineByLine() {
  const fileStream = fs.createReadStream('../input.txt');

  const rl = readline.createInterface({
    input: fileStream,
    crlfDelay: Infinity
  });

  let t = 0
  for await (const line of rl) {
    let m = line.match(/mul\([0-9]{1,3}, ?[0-9]{1,3}\)/g);
    m = m.map(e => e.split('(')[1].split(')')[0].split(','))
      .forEach(([a, b]) => t += -a * -b)
  }
  console.log(t);
}

processLineByLine();