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var express = require('express');
var app = express.createServer();
    someApp = express.createServer();

someApp.get('/', function(req, res) {
    res.end('Reached / in someApp');
});

app.use('/foobar', someApp);

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app.use(express.cookieParser());
app.use(express.session({
  secret: 'MySecret', //Should be the same across all the apps that share the same sessions.
  store: Bla, //Init your store here
  cookie: {domain: '.mydomain.com'} //The point in front here is important so that the same sessions work across all sub-domains.
}));

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//That's your route
function(req,res,next){
  var username = req.session.username;
  var filteredArray = _.filter(myArray,function(value){
    return value == username; //username is in your closure there...
  });
}

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//Animal constructor
function Animal( legCount ){
  this.legCount = legCount;
}
 
//Methods
Animal.prototype.legCount = function(){
  return( this.legCount );
};

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//Mongodb shell script
db.MyCollection.update(
  {'comments._id' : {$exists : true}}, 
  {$set : {'comments.$.author': PutYourValueHere}},
  false,
  true);

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//Javascript magic here
//We grab the value from the dom element, split it in terms where every
//term is delimited by a comma, then trim every term, re-combine them 
//together using a comma as separator and then URI encode the whole thing.
var fieldVals = encodeURIComponent(
  this.$('#product_search #field_val').val().split(',').map(function(v){
    return v.trim();
  }).join(',')
);

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//The application model itself.
var Router = Backbone.Router.extend({
  
  //Attributes
  routes : {

    //Home sweet home!
    'home'                                : 'home',
    

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var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var FooSchema = new Schema({
  dob: { type: Date},
  num: {type : Number},
  test : {
    bla : {type: Number}
  }
});

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var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var FooSchema = new Schema({
  dob: { type: Date},
  num: {type : Number},
});

Foo = mongoose.model('Foo', FooSchema);

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...

var app = express();
var server = http.createServer(app);

var io = require('socket.io').listen(server); //We're listening to the server here, not the express app.