Hacker News: mrsmrtss

New comment by mrsmrtss in "Blue Origin's New Glenn blows up during static fire test"

mrsmrtss — Fri, 29 May 2026 10:48:40 +0000

That's not how TDD works. You test the whole chain and all the components with tests and you can move from top to bottom with TDD, it's actually how you should do it.

New comment by mrsmrtss in ".NET (OK, C#) finally gets union types"

mrsmrtss — Sun, 24 May 2026 12:21:05 +0000

> while if you wrote it exactly like Java, you'd probably end up with slower code.

That's not the case for some time already, at worst you get similar performance with Java and with a little effort you can get significantly better performance.

New comment by mrsmrtss in ".NET (OK, C#) finally gets union types"

mrsmrtss — Sun, 24 May 2026 10:59:15 +0000

I don't get what the big problem is with function coloring. You basically only need async when doing IO, and you had better know when a function does it, or you may have a bad surprise at some point in the future.

New comment by mrsmrtss in ".NET (OK, C#) finally gets union types"

mrsmrtss — Sun, 24 May 2026 08:40:56 +0000

Maybe startup time was a problem before AOT?

New comment by mrsmrtss in ".NET (OK, C#) finally gets union types"

mrsmrtss — Sun, 24 May 2026 08:32:55 +0000

So you try to say that Java gets to be more semantically sound by making bad choices early on? That does not make sense. Those choices are very difficult fix today and many of them can't be fixed. Say what you want but semantically more sound Java won't be. And the boxing with C# unions can and will be addressed later, this was a deliberate choice by the team to bring unions earlier.

New comment by mrsmrtss in ".NET (OK, C#) finally gets union types"

mrsmrtss — Sun, 24 May 2026 08:19:06 +0000

For almost 10 years now, we have not published anything .NET to the Windows platform. .NET is more performant on Linux today than Windows, and I would say development is also better there (using Rider). However, we do still have devs who prefer Windows. We have built many critical systems on .NET and they just work, so they may be boring to some of the folks who like to have more excitement from their systems.

New comment by mrsmrtss in "PQCVault.exe (Windows Only)"

mrsmrtss — Wed, 13 May 2026 16:08:19 +0000

As if C# is Windows only? Today C# runs also almost everywhere.

New comment by mrsmrtss in "If AI writes your code, why use Python?"

mrsmrtss — Tue, 12 May 2026 19:38:36 +0000

C# (.NET) would probably be the winner here. Go standard library is rather minimalistic compared to it.

New comment by mrsmrtss in "If AI writes your code, why use Python?"

mrsmrtss — Tue, 12 May 2026 19:13:25 +0000

Fun it is not.

    if err != nil

It's amazing how they managed to design a new language with all the flaws of '90s languages.

New comment by mrsmrtss in "High-Level Rust: Getting 80% of the Benefits with 20% of the Pain"

mrsmrtss — Mon, 13 Apr 2026 21:28:07 +0000

C# will have more advanced sum types this year, it's currently in preview.

New comment by mrsmrtss in "High-Level Rust: Getting 80% of the Benefits with 20% of the Pain"

mrsmrtss — Mon, 13 Apr 2026 18:42:34 +0000

Well, C# has more powerful pattern matching, only compiler exhaustiveness on types is missing today. In Java, sum types (sealed interfaces/classes) require all members to have the same parent, so they can be used only in very narrow cases.

New comment by mrsmrtss in "High-Level Rust: Getting 80% of the Benefits with 20% of the Pain"

mrsmrtss — Sun, 12 Apr 2026 09:43:05 +0000

Reified generics, value types, nullable reference types, LINQ are only some of the things that would give C# an edge in DevEx today.

New comment by mrsmrtss in "Union types in C# 15"

mrsmrtss — Fri, 10 Apr 2026 12:18:17 +0000

If you work with old .NET Framework, then maybe I would agree. What kind of issues do you have in standard library or how they are only biting you? Nothing is perfect, but compared to other (popular) alternatives, C#/.NET is the best you can get today.

New comment by mrsmrtss in "Union types in C# 15"

mrsmrtss — Wed, 08 Apr 2026 18:16:44 +0000

Exactly, we have had many interns with zero C# experience become fluent in a couple of months and those with prior TypeScript or Java experience get there even faster. A good IDE (like Rider) helps also.

New comment by mrsmrtss in "Decisions that eroded trust in Azure – by a former Azure Core engineer"

mrsmrtss — Fri, 03 Apr 2026 14:30:52 +0000

Maybe this is why they retired Single Server PostgreSQL and are now offering only the new Azure Database for PostgreSQL (flexible server). Zero problem with the latter for us so far.

New comment by mrsmrtss in "Decisions that eroded trust in Azure – by a former Azure Core engineer"

mrsmrtss — Fri, 03 Apr 2026 11:29:21 +0000

I see that it's fashionable to bash everything MS related in HN, but let's not pretend that the other major cloud providers don't have their own problems (e.g. https://www.ft.com/content/7cab4ec7-4712-4137-b602-119a44f77... or https://blog.barrack.ai/google-gemini-api-key-vulnerability/). We have had a couple of critical services hosted on Azure over ten years already, call me lucky, but we haven't had any major incidents. That said, the AI Foundry side is broken garbage at the moment, but so is also AI stuff from other providers.

New comment by mrsmrtss in "Axios compromised on NPM – Malicious versions drop remote access trojan"

mrsmrtss — Tue, 31 Mar 2026 09:11:33 +0000

Fully agree with this! I think today .NET is probably the most batteries included platform you can get. This means that even if you use third-party libraries, these typically depend only on first-party dependencies, making it much less likely for something shady to sneak in.

New comment by mrsmrtss in "Java is fast, code might not be"

mrsmrtss — Fri, 20 Mar 2026 21:20:48 +0000

Autoboxing is more a Java problem mainly because of type erasure with generics. C# has "proper" generics and no hidden boxing is occuring there.

New comment by mrsmrtss in "Delve – Fake Compliance as a Service"

mrsmrtss — Fri, 20 Mar 2026 20:21:00 +0000

I think that goes for any major cloud provider, not only AWS. But nothing is free, you pay a hefty premium to get this (compared to plain infra providers like Hetzner for example).

New comment by mrsmrtss in "Tony Hoare has died"

mrsmrtss — Wed, 11 Mar 2026 11:40:17 +0000

Add WarningsAsErrors for prject and you are done.