Get by dotted path in C#
C# interview exercise on Dictionaries & Sets, difficulty 2 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write DeepGet(obj, path, fallback) that follows a dotted path such as "a.b.c" through nested Dictionary<string, object> values. Return fallback when a key is missing or something on the way is not a dictionary. A stored 0 or "" is still a value.
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