--description--

Given a string, determine if it is a valid IPv4 Address. A valid IPv4 address consists of four integer numbers separated by dots (.). Each number must satisfy the following conditions:

• It is between 0 and 255 inclusive.
• It does not have leading zeros (e.g. 0 is allowed, 01 is not).
• Only numeric characters are allowed.

--hints--

isValidIPv4("192.168.1.1") should return true.

assert.isTrue(isValidIPv4("192.168.1.1"));

isValidIPv4("0.0.0.0") should return true.

assert.isTrue(isValidIPv4("0.0.0.0"));

isValidIPv4("255.01.50.111") should return false.

assert.isFalse(isValidIPv4("255.01.50.111"));

isValidIPv4("255.00.50.111") should return false.

assert.isFalse(isValidIPv4("255.00.50.111"));

isValidIPv4("256.101.50.115") should return false.

assert.isFalse(isValidIPv4("256.101.50.115"));

isValidIPv4("192.168.101.") should return false.

assert.isFalse(isValidIPv4("192.168.101."));

isValidIPv4("192168145213") should return false.

assert.isFalse(isValidIPv4("192168145213"));

--seed--

--seed-contents--

function isValidIPv4(ipv4) {

  return ipv4;
}

--solutions--

function isValidIPv4(ipv4) {
  const parts = ipv4.split(".");
  
  if (parts.length !== 4) return false;

  for (let part of parts) {
    if (!/^\d+$/.test(part)) return false;    

    const num = Number(part);
    if (num < 0 || num > 255) return false;

    if (part.length > 1 && part.startsWith("0")) return false;
  }

  return true;
}