Three Dimensional Array from Two Dimensional Array in Javascript

Question

What is the best way to create and populate a three dimensional array by inserting a two dimensional array?

Say I have an array

    var arrState = {
        ME: ['Maine','1,328,361'],
            etc
    };

And I want to store the current values in that array each time a function is ran. Would something like this work?

var arrStateHistory;
var i = 0;

function start(){
i++;
arrHistory[i] = arrState;

}

Answer 1

arrState is an object, so you'd have to iterate with for...in. Why not use objects for everything?

var States = {
  ME: {
    name: 'Maine',
    population: 1328361
  },
  FL: {
    name: 'Florida'
    ...
  }
  ...
}

Then you can add a new state or modify one like this:

States.WA = {
  name: 'Washington',
  population: 1000000
}