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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_array(array):
 """ Deserialize a new GameHighScore from a given dictionary. :return: new GameHighScore instance. :rtype: GameHighScore """

        if array is None or not array:
            return None
        # end if
        assert_type_or_raise(array, dict, parameter_name="array")

        from pytgbot.api_types.receivable.peer import User

        data = {}
        data['position'] = int(array.get('position'))
        data['user'] = User.from_array(array.get('user'))
        data['score'] = int(array.get('score'))
        data['_raw'] = array
        return GameHighScore(**data)