Handling Routes in Node.js

When handling routes I notice that the Node.js server will call every route function for each request. I'm wondering if it would be better to use if statements or a switch statement in the main server loop so that only the required function is called for each request.

var router = require("./router.js");
var http = require('http');

http.createServer(function (request, response) {
  router.home(request, response);
  router.user(request, response);
}).listen(8080);
console.log('Server running at http://<workspace-url>/');

If you notice in the above, it looks like each request would call router.home() and then router.user(). My immediate reaction is that this looks inefficient as you'll only actually want one of those called.

Admittedly each of those functions immediately starts with an if statement to either reject or further process the request so it's almost the same thing as putting if statements in that main createServer() function. However, wouldn't the unnecessary function calls themselves be a waste? Or are there more problems with putting additional logic inside the main request handler?