Keeping Javascript reference after setting the reference to something else

I have

var myFirstArray = [{letter: 'a'}, {letter: 'b'}, {letter: 'c'}];

I would like to make a reference to myFirstArray, so I do this:

var mySecondArray = myFirstArray;

Pushing, splicing, modifying elements in myFirstArray will be shown in mySecondArray, but if I want to reset that array to something else:

myFirstArray = [];

or

myFirstArray = someOtherData;

My reference is lost. I understand why this is, but I want mySecondArray to point at whatever myFirstArray is pointing at, at any time. What's the best way to do this?

My workarounds include:

// Just empty the array and push it:
while (myFirstArray.length) myFirstArray.pop(); 
for (var x in data) myFirstArray.push(x);

// Or put the array in an object:
var viewBag = {};
viewBag.myFirstArray = [...];

var mySecondArray = viewBag.myFirstArray;

I dislike both of these options :(

Edit: Consider another scenario:

function doSomethingToMyArray (theArray) {
  // Say I get new data that will be formatted the way I want it to be
  // Shouldn't I be allowed to do this? 

  var myNewData = [{ letter: 'd' }];
  theArray = myNewData;
}

var myFirstArray = [{letter: 'a'}, {letter: 'b'}, {letter: 'c'}];

doSomethingToMyArray (myFirstArray);

// At this point, myFirstArray will still be a, b, c instead of d