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    Guided course · C# Language

    Time and Space Complexity in LINQ: back to the course

    Module 3 · Hashing Operators · Lesson 6 of 18

    Hashing Operators: GroupBy, ToLookup, ToDictionary, CountBy and AggregateBy

    15 min readTechInterviewNotes Editorial TeamUpdated 13 Oct 2026Save

    This lesson comes with Full Access

    Its text, video and cheat sheet open with Full Access. This course's free lessons open without an account. Start with Big-O for .NET Developers: Time and Space in LINQ.

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