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int myInt__object
string myString__previousKey
string myString__endKey
string returnedValue = JMap.nextKey(myInt__object, myString__previousKey, myString__endKey)Simplifies iteration over container's contents.
Accepts the @previousKey, returns the next key.
If @previousKey == @endKey the function returns the first key.
The function always returns so-called 'valid' keys (the ones != @endKey).
The function returns @endKey ('invalid' key) only once to signal that iteration has reached its end.
In most cases, if the map doesn't contain an invalid key ("" for JMap, None form-key for JFormMap)
it's ok to omit the @endKey.
Usage:
string key = JMap.nextKey(map, previousKey="", endKey="")
while key != ""
<retrieve values here>
key = JMap.nextKey(map, key, endKey="")
endwhile