Is IPv4 Address
Description
An IP address is a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication. There are two versions of the Internet protocol, and thus two versions of addresses. One of them is the IPv4 address.
IPv4 addresses are represented in dot-decimal notation, which consists of four decimal numbers, each ranging from 0
to 255
inclusive, separated by dots, e.g., 172.16.254.1
.
Given a string, find out if it satisfies the IPv4 address naming rules.
Example
-
For
inputString = "172.16.254.1"
, the output should beisIPv4Address(inputString) = true
; -
For
inputString = "172.316.254.1"
, the output should beisIPv4Address(inputString) = false
.
316
is not in range [0, 255]
.
- For
inputString = ".254.255.0"
, the output should beisIPv4Address(inputString) = false
.
There is no first number.
Input/Output
-
[execution time limit] 4 seconds (js)
-
[input] string inputString
Guaranteed constraints:
1 ≤ inputString.length ≤ 30
.
- [output] boolean
true
if inputString
satisfies the IPv4 address naming rules, false
otherwise.
[JavaScript (ES6)] Syntax Tips
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// Prints help message to the console
// Returns a string
function helloWorld(name) {
console.log("This prints to the console when you Run Tests");
return "Hello, " + name;
}
Solution
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function isIPv4Address(inputString) {
var arr = inputString.split('.');
return arr.length === 4 &&
arr.reduce((acc,el) => acc && /^\d{1,3}$/.test(el) && Number(el) < 256 ,true);
}