Sort Question (Secondary sort criteria)

[nizarl]

This is only a question. -Thanks in advance.

How would you recommend to use the sort getter if there is a primary and secondary sort.

Example:
If the below criteria has 2 of the same values I would like to use another value to do secondary sort. Both values are available inside this function.

In this example if firstName is the same I would like secondary sort by age.

scope.getters={
firstName: function (value) {
return value.firstName;
}
}