Unable to run code at branch 3.2

[shubham-pawar]

Unable to run code at branch 3.2 without following code.

server.listen(parseInt(config.PORT), config.HOST, () => {
  console.log(
    `Express is listening at ${config.SERVER_URL}`,
    `Free Mem: ${os.freemem() / 1024 / 1024}`,
  );
});

• config.PORT changed to parseInt(config.PORT)

[DarrenSem]

Agreed, I noticed that I had to use +<port string> but maybe just in case fractions don't work I should use parseInt(<port string>).

https://expressjs.com/en/api.html#app.listen
<http.Server object> = app.listen([port[, host[, backlog]]][, callback])
"This method is identical to Node’s http.Server.listen()..."

https://nodejs.org/api/http.html#class-httpserver = all the example objects use { ... , port: , ... }

And in the 4 places where property names and types are listed -- via searching for port < -- they all say <number>.

.......

The source code makes it even more clear...

https://github.com/nodejs/node/blob/main/lib/internal/validators.js#L410

function validatePort(port, name = 'Port', allowZero = true) {
  if ((typeof port !== 'number' && typeof port !== 'string') ||
      (typeof port === 'string' && StringPrototypeTrim(port).length === 0) ||
      +port !== (+port >>> 0) ||
      port > 0xFFFF ||
      (port === 0 && !allowZero)) {
    throw new ERR_SOCKET_BAD_PORT(name, port, allowZero);
  }
  return port | 0;
}

https://github.com/nodejs/node/blob/main/lib/internal/errors.js#L1667

E('ERR_SOCKET_BAD_PORT', (name, port, allowZero = true) => {
  assert(typeof allowZero === 'boolean',
         "The 'allowZero' argument must be of type boolean.");
  const operator = allowZero ? '>=' : '>';
  return `${name} should be ${operator} 0 and < 65536. Received ${determineSpecificType(port)}.`;
}, RangeError);