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The latest release of.NET 9 includes two new methods: CountBy and AggregateBy, along with the introduction of the Index method. CountBy method offers a convenient way to calculate the frequency of each key in a collection without the need for intermediate groupings via GroupBy. Aggregate by enables developers to implement more general-purpose workflows for aggregating state by key.

The switch statement selects and executes a specific section of code from a list of options known as switch sections. This selection is made by matching the switch expression with predefined patterns. To begin, create a static class file called “Switch.cs” within the console application. Insert the provided code snippet into this file.

Kazys Račkauskas: The importance of starting with a red test. The red-green-refactor cycle is a well-known mantra in test-driven development. The tests should guide the development process, he says. He explains how he mistyped tests multiple times, leading to a false impression.