advent of code, day4 part 2

script.js

/*
  Apparently this script produces too high number of valid passports. Unclear why
*/

const required = ['byr','iyr','eyr','hgt','hcl','ecl','pid']

const byrValid = x => {
	if (!x.match(/^\d{4}$/)) return false
	if (+x > 2002) return false
	if (+x < 1920) return false
	return true
}

const iyrValid = x => {
	if (!x.match(/^\d{4}$/)) return false
	if (+x > 2020) return false
	if (+x < 2010) return false
	return true	
}

const eyrValid = x => {
	if (!x.match(/^\d{4}$/)) return false
	if (+x > 2030) return false
	if (+x < 2020) return false
	return true		
}

const hgtValid = x => {
	let m = x.match(/^(\d+)(cm|in)$/)
	if (!m) return false
	if (m[2] === 'cm') {
		if (+m[1] < 150) return false
		if (+m[1] > 193) return false
	}
	if (m[2] === 'in') {
		if (+m[1] < 59) return false
		if (+m[1] > 76) return false
	}
	return true
}

const hclValid = x => {
	if (!x.match(/^#[a-f0-9]{6}$/)) return false
	return true
}

const eclValid = x => ['amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth'].includes(x)

const pidValid = x => !!x.match(/^\d{9}$/)

const validatePassport = p => {
	for (let i in required) {
		if (!p._fields.includes(required[i])) {
			p._reason = 'missing required field: ' + required[i]
			return false
		}
	}
	if (!byrValid(p.byr)) {
		p._reason = 'byr invalid: ' + p.byr
		return false
	}
	if (!iyrValid(p.iyr)) {
		p._reason = 'iyr invalid: ' + p.iyr
		return false
	}
	if (!eyrValid(p.eyr)) {
		p._reason = 'eyr invalid: ' + p.eyr
		return false
	}
	if (!hclValid(p.hcl)) {
		p._reason= 'hcl invalid: ' + p.hcl
		return false
	}
	if (!eclValid(p.ecl)) {
		p._reason = 'ecl invalid: ' + p.ecl
		return false
	}
	if (!pidValid(p.pid)) {
		p._reason = 'pid invalid: ' + p.pid
		return false
	}
	return true
}


const fs = require('fs')
const inp = fs.readFileSync('./input.txt', 'utf-8')
const passports = inp
	.split('\n\n')
	.map(p => p
		.trim()
		.split(/[\n ]+/)
		.map(x => x.split(':'))
		.reduce((o, [k, v]) => {
			o._fields = o._fields || []
			o._fields.push(k)
			o[k] = v
			return o	
		}, {})
	)

const valid = passports.filter(p => validatePassport(p))
const invalid = passports.filter(p => !validatePassport(p))

invalid.forEach(p => console.log(p._reason))

console.log('VALID', valid.length, 'INVALID', invalid.length, 'TOTAL', passports.length)