UNLAMBDA

UNLAMBDA is an open source esoteric programming language created in 1999 by David Madore.

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Unlambda is a minimal, "nearly pure" functional programming language invented by David Madore. It is based on combinatory logic, a version of the lambda calculus that omits the lambda operator. It relies mainly on two built-in functions (s and k) and an apply operator (written `, the backquote character). Read more on Wikipedia...

UNLAMBDA website
UNLAMBDA Wikipedia page
Explore UNLAMBDA snippets on Rosetta Code
UNLAMBDA on HOPL
UNLAMBDA on Esolang
UNLAMBDA appears in the Quine Relay project
See also: (3 related languages)Scheme, C, Java

Example from Riju:

`.
`.!`.d`.l`.r`.o`.w`. `.,`.o`.l`.l`.e`.Hi

Example from hello-world:

`r```````````.H.e.l.l.o. .w.o.r.l.di

Example from the Hello World Collection:

# Hello World in unlambda

`r```````````.H.e.l.l.o. .w.o.r.l.di

Feature	Supported	Token	Example
Line Comments	✓	#	# A comment
Comments	✓
Semantic Indentation	X

Language features