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I've never heard of a commercial success built off the back of Racket or J but happily went through a book on Racket and would love to do the same for J.


And yet almost nobody uses Racket and J. I think they were talking about more wide-spread use.


Many schools around the world use Racket.

The financial industry makes heavy use of K, which is closely related to J. It's not open source or free to use for commercial use, however.


Uhh, that is quite wrong, lots of company's use racket, Haskell and even start new projects with Ocaml


Then I recommend https://www.jsoftware.com/help/jforc/contents.htm


Thank you! I just bookmarked it.




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