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Functional programming language
Unlambda
Paradigm
Nearly pure functional
Designed by
David Madore
Developer
David Madore
First appeared
28 June 1999; 24 years ago (1999-06-28)
Stable release
2.0.0
/ 20 December 1999; 24 years ago (1999-12-20)
Typing discipline
Untyped
Implementation language
Scheme, C, Java
License
GPL 2.0 or later
Website
www.madore.org/~david/programs/unlambda
Unlambda is a minimal, "nearly pure"[1] functional programming language invented by David Madore. It is based on combinatory logic, an expression system without the lambda operator or free variables. It relies mainly on two built-in functions (s and k) and an apply operator (written `, the backquote character). These alone make it Turing-complete, but there are also some input/output (I/O) functions to enable interacting with the user, some shortcut functions, and a lazy evaluation function. Variables are unsupported.
Unlambda is free and open-source software distributed under a GNU General Public License (GPL) 2.0 or later.[clarification needed]
^Chu-Carroll, Mark C. (2006-08-11). "Friday Pathological Programming: Unlambda, or Programming Without Variables". Good Math, Bad Math (blog). ScienceBlogs.
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