[: ] [0: 3 3] [1: 2 2] [2: 1 1] - first last () - first (even) - (odd) - (even) - (odd) - last (even) [: ] [0: 0 0] [1: 1 1] [2: 2 2] [: - ] {"value": {"a": 1, "b": 2, "c": 3}} [0: a 1 - even] [1: b 2 - odd] [2: c 3 - even]