freeCodeCamp/controllers/home.js

/**
 * GET /
 * Home page.
 */

exports.index = function(req, res) {
  if (req.user) {
    ch = req.user.challengesHash;
    if (req.user.challengesHash[0] > 0) {
      var max = Object.keys(ch).reduce(function(max, key) {
        return (max === undefined || ch[key] > ch[max]) ? +key : max;
      });
      nextChallenge = max + 1;
      res.redirect('challenges/' + nextChallenge);
    } else {
      res.redirect('challenges/0');
    }
  } else {
    res.render('home', {
      title: 'Learn to Code and Become a Software Engineer',
      landingPage: true
    });
  }
};