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Thanks for sharing this. I've been a kdb+/q user for ~5 years. Yesterday, after coming across this, I went through the J Primer. It has some really powerful ideas in it (I didn't know Arthur was behind J as well!), and kdb+/q now feels like a distilled version of J.

I've already started prototyping a small simulator using J. Thank you so much.

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I am an amateur J-er, but I can't stop jumping back to it and implementing something quick or re-implementing something I've done in another language. I am always surprised by how quick it is to prototype. I want to learn more how to use Qt to add GUIs to my projects, since unfortunately, only old-timers like myself like command lines. It doesn't get any buzz unless it has a nicely-designed GUI. Have you checked out JD? You can get an evaluation, non-commercial key to play with it. It should complement your kdb+/q background.

JD looks very promising too for timeseries! I'm going to try it out one of these days.

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