Question

The truth … I feel a little stand with this problem

foo(function(err, a){
    foo.buu(function(err, b){
    d = x(b);
    });
});

Considering that the structure can not be modified. How do I access the variable d?

Considering … question really did not know that my problem is this.

var db = new Db(database, server);
db.open(function(err, db){
    list = new Array();
    db.collectionNames(function(err, collections){
        collections.map(function (coll){
            list.push( coll.name ) );
    });
});

but when making a console.log(list); returns only [] . I have no idea why?

Answer 1

The variable d as you have it in your code, assuming that it’s the whole code, will be attached to window.

So accessing it can be done by just d.