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Re:kharp – k version 3 Language Interpreter in C# by tosh on Monday May 18, 2026 @12:18PM (#48181803)
re 1990s:

not everything that is old is bad

k3 is a refinement of a refinement […] of APL and math notation that is both terse and composable

definitely very much worth learning today

especially if you are interested in data crunching, machine learning, and high performance computing (think GPUs, SIMD, …)

the patterns at the core of k and APL are everywhere, once you get into them you see them everywhere

the world looks different, more rich

"A language that doesn't affect the way you think about programming, is not worth knowing." — Alan Perlis

when you flip it around:

k is worth learning

in the 90s, today, and possibly 100s of years from today

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