AdventOfCode4.js

const validators = {
  byr: (v) => Number(v) > 1919 && Number(v) < 2003,
  iyr: (v) => Number(v) > 2009 && Number(v) < 2021,
  eyr: (v) => Number(v) > 2019 && Number(v) < 2031,
  hgt: (v) =>
    (v.endsWith('cm') &&
      Number(v.slice(0, -2)) > 149 &&
      Number(v.slice(0, -2)) < 194) ||
    (v.endsWith('in') &&
      Number(v.slice(0, -2)) > 58 &&
      Number(v.slice(0, -2)) < 77),
  hcl: (v) => v.match(/^#[0-9a-f]{6}$/),
  ecl: (v) => ['amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth'].includes(v),
  pid: (v) => v.match(/^[0-9]{9}$/),
};
const numValid = input.split('\n\n').filter((rawPass) => {
  const passport = Object.fromEntries(
    rawPass.split(/[ \n]/).map((item) => item.split(':'))
  );
  return Object.keys(validators).every(
    (key) => passport[key] && validators[key](passport[key])
  );
}).length;

console.log(numValid);