UNLAMBDA - Esoteric programming language

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...

Tags: esoteric programming language
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

Language features

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