>Unsurprisingly a lot of finance companies may i ask why?

mgaunard · 2024-07-28T09:13:29.000000Z

because the core of what they do is working with time series and making analysis and predictions.

agumonkey · 2024-07-28T10:40:05.000000Z

well arrays of digits are often daily duty in finance, and also historically, quite a few talks online involved people in finance IIRC

ps: oh, and commercial APL/j/k engines are said to be extremely optimized

LamarDavis · 2024-07-28T17:06:10.000000Z

but why these esoteric languages specifically? why not C++ with library optimized for vector operations? it would certainly make debugging easier.

hoosieree · 2024-07-28T18:55:41.000000Z

REPL-driven development keeps me in the flow. I can write (and test) multiple different approaches to a problem in J or K before I can finish typing the first approach in C++. And that's not even counting time and context switching costs of compiling and running the C++ code.

Lisps and Smalltalk also have repl-oriented development, but they're verbose. Even tab-selecting a Copilot generated autocomplete takes more keystrokes than some array language programs.

agumonkey · 2024-07-29T16:36:07.000000Z

I never worked with them but I assume it's the same reason cpp guys end up doing some in python, prototyping is easier with instant/short feedback. Later you solidify the solution in statically typed languages.

mgaunard · 2024-07-28T20:19:05.000000Z

The real-time trading systems are in C++, while the data analysis, which happens offline, is either done in Q, R or Python (pandas, polars, etc.)