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No, they are JavaScript, it is array based programming wrapped in a reactive functional-declarative approach. Simply array of objects cascading with state. {#await promise} is more cryptic than any useHook function implementation.

Yep, Kafka is probably the most popular one. I've heard that the team is looking forward to replace the remaining Scala code in the project with Java once pattern matching and co. land. Spark is another beast that was written in Scala. Many are reporting a high cost for compatibility. Nowadays, Scala community is all about Typelevel and ZIO, if you are not a category theory minded person, then you will have a hard time picking it up.

> Being written in a language that isn't well-suited to large projects and refactoring efforts doesn't help either.

I know that Borg was written in Java and Kubernetes in Go. Though the latter had a reputation in the beginning as a systems programming language, its purpose was actually to build large-scale cloud infrastructure projects with it and it proved formidably well suited for the task. It compiles fast, anyone can read it, good tooling and it is efficient for the layer on which it is meant to be deployed. Go, as Java is one of the most productive languages in use today, judging by the ecosystems they have spawned.

> but in the end that will mean more for your career than anything else, unfortunately.

I strongly disagree. In my organisation engineers have higher salaries than "people persons" like managers, product owners etc. Maybe it is something Eastern Europe (Romania) does better. In my country, people become managers when they don't know what to do in life, when they have not mastered any skill in 12 years of mandatory education + higher education. People who can't code at the end of the CS curriculum have three choices basically: HR, PMO or do a Master in a totally unrelated field to increase your employability. Do you really see yourself the "acting" leader, answering to phone calls all day like a secretary and asking people about the status of their tickets? I hope not. A "people person" is easily replaceable, a good engineer is not. When the financial crisis comes and the line is drawn, engineering skills remain. That is not to say that soft skills do not matter, quite the opposite, just don't make it a day job, you will become vulnerable.

Why would you need operator overloading in a low-level language? It's not like you are gonna write Jupyter notebooks with it. Zig is not meant to replace MATLAB, Python or Julia. I would use it instead to build the backbone of such a data science platform.