English Computing Dictionary
one-liner wars
A game popular among {hackers} who code
in the language {APL} (see {write-only language} and {line
noise}). The objective is to see who can code the most
interesting and/or useful routine in one line of {operators}
chosen from APL's exceedingly {hairy} primitive set. A
similar amusement was practiced among {TECO} hackers and is
now popular among {Perl} aficionados.
{Ken Iverson}, the inventor of APL, has been credited with a
one-liner that, given a number N, produces a list of the prime
numbers from 1 to N inclusive. It looks like this:
(2 ◦ 0 :.◦ T o.| T) / T <- iN
where "o" is the APL null character, the assignment arrow is a
single character, and "i" represents the APL iota.
[{Jargon File}]