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String Interpolation
Prerequisites: Strings
A $"..." string embeds expressions directly, using {} — C#'s
equivalent of JavaScript's template literals or Python's f-strings:
string name = "Ada";
int age = 36;
Console.WriteLine($"{name} is {age} years old");
Console.WriteLine($"Pi is about {3.14159:F2}"); // Pi is about 3.14
This has almost entirely replaced older string.Format(...)-style
calls in modern C# code.