Shoutbox

Say I had an array like this (in its practical use, the objects would have data in, but for this example, I don't really need that).

js code:

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var MyArr = [];
MyArr["X"] = {};
MyArr["Z"] = {};
MyArr["W"] = {};
MyArr["Y"] = {};

---

If I loop through that, it'll go in the written order (X, Z, W, Y).  Is there a relatively simple way of sorting the keys alphabetically (like the PHP ksort() function)?