Simple node.js router

router.js

function Router () {
    this.routes = [];
    this.fallback = function(request, response) { };

    this.run = function (request, response) {
        var pathname = url.parse(request.url).pathname;

        var match = this.routes.map(function(route) {
            var routeUrl = route.url;
            var requestUrl = pathname.split('/');

            if ((!route.wildcard && requestUrl.length !== routeUrl.length) ||
                (route.wildcard && requestUrl.length < routeUrl.length))
                return null;

            var args = [];
            var wildcard = null;
            var length = route.wildcard ? requestUrl.length : routeUrl.length;

            for(var i = 0; i < length; i++) {
                if (wildcard !== null) {
                    wildcard.push(requestUrl[i]);
                } else {
                    if (routeUrl[i].startsWith(':')) {
                        if (routeUrl[i].endsWith('+')) {
                            wildcard = [];
                            wildcard.push(requestUrl[i]);
                        } else {
                            args.push(requestUrl[i]);
                        }
                    } else if (routeUrl[i] !== requestUrl[i]) {
                        return null;
                    }
                }               
            }

            if (wildcard) args.push(wildcard);

            return { route, args };

        }).filter(i => { return i != null; })[0];

        if (match) {
            match.route.callback.apply(null, [request, response].concat(match.args));
        } else {
            this.fallback(request, response);
        }
    }

    this.get = function (url, callback) {
        if (typeof url === 'function') {
            this.fallback = url;
            return;
        }

        var parts = url.split('/');
        var wild = parts[parts.length - 1].startsWith(':') && parts[parts.length - 1].endsWith('+');
        
        this.routes.push({ url: parts, callback, wildcard: wild });
    }
}

usage.js

var router = new Router();

// Ex.- localhost/sample/some_id/dick_wolf
router.get('/sample/:id/:name', function(request, response, id, name) {
	response.writeHead(200, {'Content-Type': 'text/plain'});
	response.end('This is sample [' + id + ', ' + name + ']');
});

router.get('/sample', function(request, response) {
	response.writeHead(200, {'Content-Type': 'text/plain'});
	response.end('This is just a simple sample');
});

// Route with wildcard param in the end. "name" arg will be an array
router.get('/get/:name+', function(request, response, name) {
	response.writeHead(200, {'Content-Type': 'text/plain'});
	response.end('Yes, ' + name);
});

// Calls if there is no routes matches current path
router.get(function(request, response) {
    response.writeHead(404, {'Content-Type': 'text/plain'});
    response.end('[404] Not found');
});

http.createServer(function(request, response) {
	router.run(request, response);
}).listen(80);