app.set('port', port) 'TypeError: undefined is not a function'. Beginner, need ideas

Question

I\'m an amateur learning to build with node.js. I\'ve been following a tutorial to create my first node.js app. It worked perfectly until I entered \'npm start\'. The log is:

Answer 1

In my case I simply moved the normalizePort function before the function was called. This was in coffeescript but I've converted it to javascript here.

normalizePort = function(val) {
  var port;
  var port;
  port = parseInt(val, 10);
  if (isNaN(port)) {
    return val;
  }
  if (port >= 0) {
    return port;
  }
  return false;
};

port = normalizePort(process.env.PORT || '4000');