Ordered hash in JavaScript

Question

JavaScript objects have no order stored for properties (according to the spec). Firefox seems to preserve the order of definition of properties when using a for...in<

Answer 1

One trick I do is to store the data in a regular unordered hash, and then store the preferred order in an array. In JS, you can even make the order array part of the hash itself.

var myHash = {
  a: "2",
  b: "3",
  c: "1"
};

myHash.order = [ myHash.c, myHash.a, myHash.b ];

alert("I can access values by key. Here's B: " + myHash.b);
var message =  "I can access also loop over the values in order: ";

for (var i=0;i

It's not exactly elegant, but it gets the job done.