Question

    var config = {
        a: 'test',
        b: {
            c: // SOmeway to access config a value
        }
    }

IS there any way to access value from class b?

Answer 1

Neither of those things is a class. They’re objects.

No, there’s no way to access config.a where you have c: in your code, all within the same object literal. You can do it after the fact:

var config = {
    a: 'test',
    b: {
    }
};
config.b.c = config.a;

Note that config.b.c will receive the value of config.a. If someone updates config.a later, config.b.c will not be updated.

If c were a function, you could access config.a from within it:

var config = {
    a: 'test',
    b: {
        c: function() {
           // You can use `config.a` here
        }
    }
};

There, each time you call c, you’ll be using the current value of config.a.