> Union types Yes, these are missing in C#. > Object literals You could use records[1], or anonymous types[2]. > Functions as first class citizens There's

> Union types Yes, these are missing in C#. > Object literals You could use records[1], or anonymous types[2]. > Functions as first class citizens There's delegates[3] and lambda expressions[4]. Is there anything that's missing here that you need? You can use lambda expressions almost exactly like you might in JS/TS, even omitting the type: var squared = x => x * x; And if you want even more functional, you could always use F#. [1]: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/record https://learn.microsoft.com/en-us/dotnet/csharp/language-ref... [2]: https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/types/anonymous-types https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals... [3]: https://learn.microsoft.com/en-us/dotnet/api/system?view=net-7.0#delegates https://learn.microsoft.com/en-us/dotnet/api/system?view=net... [4]: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/lambda-expressions https://learn.microsoft.com/en-us/dotnet/csharp/language-ref...