aocDay4Part2.js

const d4p2 = data => {
  const getObj = passport => passport
    .split(/[^a-z0-9:#]/)
    .reduce((acc, str) => {
      const splitString = str.split(':');
      acc[splitString[0]] = splitString[1];
      return acc;
    }, {});

  const validate = ({
      byr,
      iyr,
      eyr,
      hgt,
      hcl,
      ecl,
      pid,
    }) => {
      const heightUnit = hgt?.slice(hgt.length - 2);
      const heightValue = hgt?.slice(0, hgt.length - 2);
      
      return byr >= 1920 && byr < 2003 &&
      iyr >= 2010 && iyr < 2021 &&
      eyr >= 2020 && eyr < 2031 &&
      (heightUnit === 'cm' && heightValue >= 150 && heightValue < 194 || heightUnit === 'in' && heightValue >= 59 && heightValue < 77) &&
      /^#([a-f0-9]{6})$/.test(hcl) &&
      ['amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth'].includes(ecl) &&
      /^[0-9]{9}$/.test(pid);
    }
  
  return data
    .split('\n\n')
    .map(getObj)
    .map(validate)
    .filter(Boolean)
    .length;
};
      
d4p2(document.body.innerText)