M4

M4.js

function handleReply(ip, symbolicAddress) {
  if (timeout) {
    clearTimeout(timeout);
  }

  if (ip) {
    const elapsedTime = `${(process.hrtime(startTime)[1] / 1000000).toFixed(3)} ms`;

    if (ip === previousIP) {
      process.stdout.write(`  ${elapsedTime}`);
    } else if (tries === 1) {
      process.stdout.write(`\n ${ttl}  ${symbolicAddress ? symbolicAddress : ip} (${ip}) ${elapsedTime}`);
    } else {
      process.stdout.write(`\n    ${symbolicAddress ? symbolicAddress : ip} (${ip}) ${elapsedTime}`);
    }
  } else {
    if (tries === 1) {
      process.stdout.write(`\n ${ttl}  * `);
    } else {
      process.stdout.write(`* `);
    }
  }

  if ((ip == DESTINATION_IP && tries === 3) || ttl >= MAX_HOPS) {
    console.log('');
    process.exit();
  }

  previousIP = ip;

  setImmediate(sendPacket);
}