Um, what? This is the sort of knowledge you definitely do not need in your back pocket. It’s literally the perfect kind of question for AI to answer. Also this is such a moving target that I suspect most hiring processes change at a slower pace.
I crack myself up.
And it never is. There's just about nothing that fits this criteria.
Explain how it works and what you use for.
If you don’t know this, you’re not a programmer in any language, platform, framework, front end or back end.
It’s my go-to interview question.
Tell me what’s wrong with that.
It's such a foundational thing in all of modern programming, that I just can't imagine someone being "skilled" and not knowing even this much. Even scripting languages use hash tables, as do all interpreted languages such as Python and JavaScript.
Keep in mind that I'm not asking anyone to implement a hash table from scratch on a white board or some nonsense like that!
There ought to be a floor on foundational knowledge expected from professional developers. Some people insist on this being zero. I don't understand why it shouldn't be at least this?
You can't get a comp-sci or comp-eng degree from any reputable university (or even disreputable ones) without being taught at least this much!
What next? Mechanical engineers who can't be expected to hold a pencil or draw a picture using a CAD product?
Surgeons that have never even seen a scalpel?
Surveyors that don't know what "trigonometry" even means?
Where's your threshold?
its still a bad interview question unless you’re hiring someone to build ai agents imho
But by the same logic, should we be asking for the same knowledge of the language server protocol and algorithms like treesitter? They're integral right now in the same way these new tools are expected to become (and have become for many).
As I see it, knowing the internals of these tools might be the thing that makes the hire, but not something you'd screen every candidate with who comes through the door. It's worth asking, but not "critical." Usage of these tools? sure. But knowing how they're implemented is simply a single indicator to tell if the developer is curious and willing to learn about their tools - an indicator which you need many of to get an accurate assessment.
I know plenty of good communicators who aren't using AI effectively. At the very least, if you don't know what an LLM is capable of, you'll never ask it for the things it's capable of and you'll continue to believe it's incapable when the reality is that you just lack knowledge. You don't know what you don't know.