Compute Average IMDB Rating for TV Show Season using node.js

imdb_season_ratings.js

var jsdom = require('jsdom');

var re = /(\d+)\.(\d+)/;

jsdom.env({
    // IMDB show URL + '/eprate' (Simpsons URL below)
    html: 'http://www.imdb.com/title/tt0096697/eprate',
    scripts: ['http://code.jquery.com/jquery-1.7.1.min.js'],
    done: function (errors, window) {
        var $ = window.$;
        var season2Ratings = [];
        $('tr').each(function () {
            var entries = $(this).find('td');
            if (entries) {
                var firstText = $(entries[0]).text();
                var m = firstText.match(re);
                if (m) {
                    var season = m[1];
                    var rating = $(entries[2]).text();
                    if (season2Ratings[season]) {
                        season2Ratings[season].push(rating);
                    } else {
                        season2Ratings[season] = [rating];
                    }
                }
            }
        });
        season2Ratings.forEach(function (ratings, season) {
            var sum = 0,
                numRatings = 0;
            ratings.forEach(function (rating) {
                sum += parseFloat(rating);
                numRatings++;
            });
            console.log((sum / numRatings).toFixed(2) + " average rating for season " + season);
        });
        process.exit(0);
    }
});