Today we will review Node.Js. We talked about Node.js, Connect and Express in earlier discussions. We saw that the calls were asynchronous and that we could add Backbone for MVC on  the web server for the user interface. Express supports both production and development settings. Changes made require restart to the application and a node supervisor helps in this regard.
Sample server code to look up a phonebook works like this:
Server.js :
var express = require('express');
var app = express();
app.set('view engine', 'ejs');
app.set('view options', { layout : false });
app.use(express.bodyParser());
app.use(app.router);
app.post('/search', function (req, res) {
    var result = words.search(req.body.pattern).result;
    res.render('result', {words: result, pattern: req.body.pattern });
});
app.listen(process.env.PORT || config.port);

function search(word) {
// parameter validation and sanitization
var toSearch = word;
var result = _.filter(dictionary, function(w) {
var index = binarySearch(dictionary,w);
return index == -1 ? null ; dictionary[index];
});
return {result :result};
}
}

function binarySearch(dictionary, value)
{
   int start = 0;
   int end = dictionary.length - 1;
 
   while (start <= end)
   {
      int mid = (start + end) >>> 1
      var midword = dictionary[mid];

      if (midword < value)
           start = mid + 1
      else if (midword > value)
          end = mid -1
      else
          return mid;
    }
   return -(start+1);
}

We will next cover Clojure in this post which provides easy access to Java framework.  Closure compiles to Java byte code.