gistfile1.txt

var exchanges = [{
    name:"NSYE",
    stocks:[{
        symbol:"LOL",
        closes:[{
            date: new Date(2014,11,24), 
            price:240.10
        },{
            date: new Date(2014,9,23), 
            price:241.10
        },{
            date: new Date(2014,8,22), 
            price:232.08
        }]
    }]
},{
    name:"TNZ",
    stocks:[{
        symbol:"XFX",
        closes:[{
            date: new Date(2014,7,24), 
            price:521
        },{
            date: new Date(2014,5,23), 
            price:511
        },{
            date: new Date(2014,11,22), 
            price:519
        }]
    }]
}]
                 
                 
 Array.prototype.concatAll = function(){
     var results = [];
     this.forEach(function(subarray){
         subarray.forEach(function(item){
             results.push(item);
         });
     });
   
   return results;
  
 };                
             

var stocks = exchanges.map(function(o){
     return o.stocks.map(function(e){
          return e.closes.filter(function(aj){
             return aj.date.getMonth() == 11
          }).
          map(function(s){
            return {
              price:s.price,
              name: o.name
            }
          })
     }).concatAll()
}).concatAll()



stocks.forEach(function(o){
  console.log(o)
})