script.js

var MODULES = new ActiveXObject("Scripting.Dictionary");
var n; // undefined

MODULES.Add(n, "Test value");

var keys = new VBArray(MODULES.Keys()).toArray();
WScript.Echo("Array length: " + keys.length);

WScript.Echo("Key at index 0: " + (keys[0] === undefined ? "undefined" : keys[0]));
WScript.Echo("Is index 0 enumerable? " + (keys.hasOwnProperty(0) ? "Yes" : "No"));

WScript.Echo("for-in loop:");
for (var index in keys) {
    WScript.Echo("  Index: " + index + ", Value: " + keys[index]);
}
WScript.Echo("end");