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Summary
This PR adds comprehensive usage examples for the new .NET 9 Enumerable.AggregateBy method. These examples are designed to help developers understand the difference between using a constant seed and a seed selector for stateful aggregations.
Examples Added:
Multi-value Aggregation (seedSelector): Demonstrates using a tuple (Total, Count) to compute both the sum and the frequency of elements per group in a single pass.
Simple Summation (seed): Illustrates the use of a constant decimal seed to calculate total values (salaries) grouped by a key (department).
Technical Highlights:
Efficiency: The examples emphasize the benefit of AggregateBy over GroupBy by avoiding the allocation of intermediate grouping collections.
Real-world Context: Uses an Employee class scenario to make the utility of the API immediately clear to developers.
Each example includes input data, the LINQ implementation, and the expected console output.