Validate IP Address

Description

doc

Solutions

First Idea

function isIPv4(ip) {
  const digits = ip.split('.')
  if (digits.length !== 4) {
    return false
  }

  if (digits.some((v) => v.length < 1 || (v.length > 1 && v[0] === '0'))) {
    return false
  }

  if (digits.some((v) => !/^[\d]*$/.test(v))) {
    return false
  }

  if (
    digits.map((v) => parseInt(v)).some((v) => isNaN(v) || v < 0 || v > 255)
  ) {
    return false
  }

  return true
}

function isIPv6(ip) {
  const digits = ip.split(':')
  if (digits.length !== 8) {
    return false
  }

  if (digits.some((v) => v.length < 1 || v.length > 4)) {
    return false
  }

  if (digits.some((v) => !/^[\da-fA-F]*$/.test(v))) {
    return false
  }

  if (digits.some((v) => isNaN(parseInt(v, 16)))) {
    return false
  }

  return true
}

/**
 * @param {string} queryIP
 * @return {string}
 */
var validIPAddress = function (queryIP) {
  if (isIPv4(queryIP)) {
    return 'IPv4'
  }

  if (isIPv6(queryIP)) {
    return 'IPv6'
  }

  return 'Neither'
}