Function jsonGetKeys( jsonObject )

Description:
Returns an array giving keys for each key-value pair in a JSON object. The members of a JSON object are not ordered, so no order can be guaranteed in the output array.
Parameters:
jsonObject (JSONObject)
JSON object
Return Value (array of String):
string array containing keys of object
Example:
jsonGetKeys(jsonObject("{\"one\", 1, \"two\", 2, \"three\", 3}")) = ["one", "two", "three"]
Signature:
String[] jsonGetKeys(JSONObject)