how to access an object's members with array values

[joejoeknows]

I have an object that I want to access it's members by using a list of "headers" in an array that match the object's member names. I pull the values of the "headers" from a spreadsheet into an array (see log output at bottom). Then, when I iterate over the array using a for loop, I can't seem to access the Object's members. Why doesn't this work?

 var e = new Object();
  e.parameter = new Object();
  e.parameter.identifier = "test";
  //...

  Logger.log(Utilities.jsonStringify(e)); 
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var renters = ss.getSheetByName("Renters");
  
  var headers = ObjApp.camelArray(renters.getRange(1,1,1,renters.getLastColumn()).getValues()[0]);
  Logger.log(headers);
  var data = [];
  for(var h=0;h<headers.length;h++)
  {
    Logger.log(headers[h]);
    data.push(e.parameter[headers[h]]);
  };

  Logger.log(data);

LOG OUTPUT:
{"parameter":{"indentifier":"test"}}
[identifier, address, tenants, gracePeriodDays, gracePeriodRecurrence, lateFeeAmount, startingBalance, startingDate, rentAmount, dayOfMonthDue]
identifier
address
tenants
gracePeriodDays
gracePeriodRecurrence
lateFeeAmount
startingBalance
startingDate
rentAmount
dayOfMonthDue
[null, null, null, null, null, null, null, null, null, null]

It seems to work in my second example when I don't pull the string value from an array over an iteration.

function test(e){
  var o = new Object();
  o.test1 = new Object();
  o.test1.test2 = 0;
  var test3 = "test2";
  Logger.log(o.test1[test3]);
  Logger.log(Utilities.jsonStringify(o));
};

LOG OUTPUT:
0.0
{"test1":{"test2":0}}

[paul_wilkins]

The first example seems to work when the spreadsheet parts are removed and the headers variable just contains an array of string values:

var headers = ['identifier', 'address', 'tenants', 'gracePeriodDays', 'gracePeriodRecurrence', 'lateFeeAmount', 'startingBalance', 'startingDate', 'rentAmount', 'dayOfMonthDue'];

I'd check what typeof says about what is stored at headers[h]