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K - Programming language

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K is a programming language created in 1993 by Arthur Whitney.

#433on PLDB 30Years Old

K is a proprietary array processing language developed by Arthur Whitney and commercialized by Kx Systems. Since then, an open-source implementation known as Kona has also been developed. The language serves as the foundation for kdb+, an in-memory, column-based database, and other related financial products. Read more on Wikipedia...

Example from hello-world:
"Hello World\n"
/ Hello world in K "Hello world!"

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