hexpress6.js

function Hexpress () {
  this.routeMappings = {};
};

Hexpress.prototype.get = function (route, handler) {
  this.routeMappings[`GET ${route}`] = handler;
};

// Usage:

const app = new Hexpress();
app.get('/api/hexes', (req, res) => res.send('Loads of hexes'));
app.get('/api/cauldrons', (req, res) => res.send('Loads of cauldrons'));

app.listen(3000);