Update 468-validate-ip-address.js

Author: everthis

468-validate-ip-address.js

@@ -1,3 +1,37 @@
+/**
+ * @param {string} IP
+ * @return {string}
+ */
+const validIPAddress = function (IP) {
+  if (IP.indexOf('.') > 0) return validIPv4(IP) ? 'IPv4' : 'Neither'
+  else return validIPv6(IP) ? 'IPv6' : 'Neither'
+}
+
+const validIPv4 = function (IP) {
+  const strs = IP.split('.')
+  if (strs.length !== 4) return false
+  for (let str of strs) {
+    if (str.length === 0) return false
+    if (str.match(/[^0-9]/)) return false
+    if (str.length > 1 && str.charAt(0) === '0') return false
+    if (+str > 255) return false
+  }
+  return true
+}
+
+const validIPv6 = function (IP) {
+  const strs = IP.split(':')
+  if (strs.length !== 8) return false
+  for (let str of strs) {
+    if (str.length === 0) return false
+    if (str.length > 4) return false
+    if (str.match(/[^0-9a-fA-F]/g)) return false
+  }
+  return true
+}
+
+// another
+
 /**
  * @param {string} IP
  * @return {string}