For those who haven't heard of or aren't familiar with K, the Wikipedia page[1] has a remarkably helpful brief overview:
> K is a proprietary array processing programming language developed by Arthur Whitney and commercialized by Kx Systems. The language serves as the foundation for kdb+, an in-memory, column-based database, and other related financial products. The language, originally developed in 1993, is a variant of APL and contains elements of Scheme. Advocates of the language emphasize its speed, facility in handling arrays, and expressive syntax.
There was also a great thread on HN about it as well[2].
And many programming languages do, for example C# and Racket. I have a feeling it isn't very hard to implement, since that's what you typically do if you need complex numbers in Java.
> K is a proprietary array processing programming language developed by Arthur Whitney and commercialized by Kx Systems. The language serves as the foundation for kdb+, an in-memory, column-based database, and other related financial products. The language, originally developed in 1993, is a variant of APL and contains elements of Scheme. Advocates of the language emphasize its speed, facility in handling arrays, and expressive syntax.
There was also a great thread on HN about it as well[2].
[1] https://en.wikipedia.org/wiki/K_(programming_language)
[2] https://news.ycombinator.com/item?id=28493283