var MongoClient =  require('mongodb').MongoClient;

MongoClient.connect('mongodb://localhost:27017/school', function(err,db){

    if(err) throw err;
    var query = db.collection('students');
    var cursor = query.find({});
    //cursor.skip(1);
    //cursor.limit(10);
    //cursor.sort({"State":-1,"Temperature":-1});
var temp = "";

var i = 0;
//console.log(cursor)
    cursor.each(function(err,doc){

//  Ejemplo 1 db.collection('collection').findOne(query,function(err,doc){
// Ejemplo 2 db.collection('collection').find(query).toArray(function(err,doc){
        if(err) throw err;

if (doc == null){
        return db.close();
    }

    var kaz = doc.scores[2];
    var giz = doc.scores[3];

    var foo = doc.scores;

//  console.log(kaz.score + " y su hermana " +  giz.score);
//  console.log(kaz.score < giz.score);
console.log(doc.name)
if(kaz.score < giz.score){

foo.splice(2,1);
query.update({"_id":doc._id},{$unset : {"scores":""}},function(err,updoc){
    console.log("Se borro bien");
});
query.update({"_id":doc._id},{$set: {"scores": foo} } ,function(err,updoc){
    console.log("Se inserto " + updoc);
});
    console.log(foo);

}else{
    foo.splice(3,1);
    query.update({"_id":doc._id},{$unset : {"scores":""}},function(err,updoc){
    console.log("Se borro bien");
});
query.update({"_id":doc._id},{$set: {"scores": foo} },function(err,updoc){
    console.log("Se inserto " + updoc);
})
    console.log(foo);
}


    });

});