advent of code day 3

aoc_day03.ts

const input = await Deno.readTextFile("input.txt");

function matchMuls(str: string): string[] {
  return str.match(/mul\(\d+,\d+\)/g) || [];
}

function calculateMulSum(arr: string[]): number {
  return arr.reduce((acc, str) => {
    const [a, b] = str.slice(4, -1).split(",").map(Number);
    return acc + a * b;
  }, 0);
}

function calculateTotal(input: string, excludeDont: boolean = false): number {
  const filteredInput = excludeDont
    ? input.replace(/don't\(\).+?(do\(\)|$)/gs, "")
    : input;

  const mulMatches = matchMuls(filteredInput);

  return calculateMulSum(mulMatches);
}

const total_1 = calculateTotal(input);
const total_2 = calculateTotal(input, true);

console.log({ total_1, total_2 });