Advent of Code Day 4

day4.js

const puzzleInput = ``

// Part 1
const parseInput = (input) => {
  return input.replace(/\s/gi, '\n').split('\n\n')
}

const validateSurfaceFields = passport => {
  const fields = passport.split('\n').map(field => field.substr(0, 3))
  return fields.length === 8 || (fields.length === 7 && !fields.includes('cid'))
}

const partOne = (input) => {
  const passports = parseInput(input)
  const validCount = passports.reduce((acc, passport) => acc + +validateSurfaceFields(passport), 0)
  console.log(validCount)
}

partOne(puzzleInput)

// Part 2
const validateField = (field) => {
  const [key, value] = field.split(':')
  const num = parseInt(value)

  switch (key) {
    case 'byr': return !!num && num >= 1920 && num <= 2002
    case 'iyr': return !!num && num >= 2010 && num <= 2020
    case 'eyr': return !!num && num >= 2020 && num <= 2030
    case 'hgt': {
      if (value.endsWith('in')) {
        return !!num && num >= 59 && num <= 76
      }
      if (value.endsWith('cm')) {
        return !!num && num >= 150 && num <= 193
      }
      return false
    }
    case 'hcl': return !!value.match(/^#[0-9a-f]{6}$/)
    case 'ecl': return !!value.match(/^(amb|blu|brn|gry|grn|hzl|oth)$/gi)
    case 'pid': return !!value.match(/^\d{9}$/gi)
    case 'cid': return true
    default: return false
  }
}

const validateDeepFields = passport => {
  const fields = passport.split('\n')
  const keys = fields.map(field => field.substr(0, 3))
  const correctFieldCount = keys.length === 8 || (keys.length === 7 && !keys.includes('cid'))
  return correctFieldCount && fields.reduce((acc, field) => acc && validateField(field), true)
}

const partTwo = (input) => {
  const passports = parseInput(input)
  const validCount = passports.reduce((acc, passport) => acc + +validateDeepFields(passport), 0)
  console.log(validCount)
}

partTwo(puzzleInput)