Javascript: build multidimensional Array programmatically

Question

My goal is to be able to keep track of my position/depth in a JSON tree by adding elements to an Array and then access nested nodes in the JSON utilizing this Array. By now say the Array foo it has one element:

foo = ["customers"]

so that element would act as a reference for a JSON children, say:

jsonTree["customers"]

where jsonTree is something like:

{
"customers":{
  "name": "J. Goldsmith",
  "orders": [{
    "order": "1",
    "order": "2"
  }]
 }
}

Then foo eventually varies its size and become

foo = ["customers","orders"]

So the JSON reference would become

jsonTree["customers"]["orders"]

Now say that customers.orders can become customers.orders.order.date.etc.etc... Is there any way to build the jsonTree reference programmatically with N dimensions based on the N elements of foo Array?

Some examples:

I have ["John","Williams"] -> i want to build composer["John"]["Williams"] ["Erich","Wolfgang","Korngold"] -> i want to build composer["Erich"]["Wolfgang"]["Korngold"]

Answer 1

I think what you want is some sort of lookup function like that I describe here, except modified slightly to take an Array instead of multiple arguments

function generateLookupFunction(o) {
    return function lookup(arr) {
        var i, e = o;
        for (i = 0; i < arr.length; ++i) {
            if (!e.hasOwnProperty(arr[i]))
                throw "PathNotFoundError: " + arr.slice(0, i + 1).join('/');
            e = e[arr[i]];
        }
        return e;
    };
}

Then

var lookup = generateLookupFunction(jsonTree),
    foo = ["customers","orders"];
lookup(foo);
/*[{
    "order": "1",
    "order": "2"
}] */