Recently I was asked by a developer what this code block here actually is:

public Friend(string firstName, string middleName, string lastName)
  => (FirstName, MiddleName, LastName) = (firstName, middleName, lastName);

This is actually a constructor that uses an expression body and tuples.

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In the previous blog posts you learned about different C# 9.0 features:

• Top-level statements
• Init-only properties
• Records
• Target-typed new expressions
• Improved Pattern Matching
• Pattern Matching in Switch Expressions

In this blog post, let's look at another very interesting feature of C# 9.0, the covariant return types.

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