K - Programming language

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

#342on PLDB

33Years 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...

Tags: programming language, arrayLang
Early development of K happened in Kx Systems
There are 2,478 Project Euler users using K
Explore K snippets on Rosetta Code
K on HOPL
Pygments supports syntax highlighting for K
See also: (8 related languages) Scheme, Q, APL, SQL, J, SQL-92, Solaris, Linux
11 PLDB concepts link to K: F, cK, oK, Goal, Klong, ktye/k, Lil, ngn/k, SLACK, U, XY

Example from hello-world:

"Hello World\n"

Example from the Hello World Collection:

/ Hello world in K

"Hello world!"

Language features

Feature	Supported	Example	Token
Binary Literals	✓	/ [01]+b
Integers	✓	/ [0-9]+[ihtuv]
Floats	✓	/ ([0-9][.]?[0-9]+\|[0-9]+[.]?[0-9])[eE][+-]?[0-9]+[ef]?
Hexadecimals	✓	/ [0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}
Line Comments	✓	/ A comment	/
Comments	✓
Semantic Indentation	X