Length of a JavaScript object (that is, associative array)

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If I have a JavaScript associative array, say:

var myArray = new Object();
myArray["firstname"] = "Gareth";
myArray["lastname"] = "Simpson";
myArray["age"] = 21;

Is there a built-in or accepted best practice way to get the length of this array?

JavaScript does not have associative arrays -- it only has objects, which can be used as a notion of associative arrays.**

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