전화번호 포맷팅

function formatPhoneNumber(phoneNumber) {
  const cleaned = phoneNumber.replace(/\D/g, '')

  if (cleaned.length === 11) {
    return cleaned.replace(/(\d{3})(\d{4})(\d{4})/, '$1-$2-$3')
  } else if (cleaned.length === 10 && cleaned.startsWith('02')) {
    return cleaned.replace(/(\d{2})(\d{3})(\d{4})/, '$1-$2-$3')
  } else if (cleaned.length === 10) {
    return cleaned.replace(/(\d{3})(\d{3})(\d{4})/, '$1-$2-$3')
  } else if (cleaned.length === 9 && cleaned.startsWith('02')) {
    return cleaned.replace(/(\d{2})(\d{3})(\d{3})/, '$1-$2-$3')
  }
  return 'Invalid phone number'
}

formatPhoneNumber('01012341234') // 010-1234-1234
formatPhoneNumber('021234567') // 02-123-4567

거리 만km 포맷팅

function formatToManKm(distance: number): string {
  const manKm = (distance / 10000).toFixed(1)

  return `${manKm}만km`
}

formatToManKm(104335) // "10.4만km"