Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Unlambda: Basic principles, Original built-in functions & Overview

Unlambda is a minimal, "nearly pure" 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…

Language: English [EN]
Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.
100%
More settings
100% 100% 100% 100% 100%

Unlambda topic overview

The analysis highlights Basic principles, Original built-in functions and Overview as prominent areas in the source structure around Unlambda.

Related topics
20
Source areas
3
Connected nodes
23
Extracted relationships
24
Concept neighborhoods
16
Bridge connections
23

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Overview · 10 topics
Basic principles · 5 topics
Original built-in functions · 5 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Designed by
David Madore
Developer
David Madore
First appeared
28 June 1999; 27 years ago (1999-06-28)
Implementation language
Scheme, C, Java
License
GPL 2.0 or later
Paradigm
Nearly pure functional

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

Basic principles

Original built-in functions

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How Unlambda connects Entity context

The extracted context around Unlambda shows recurring relationship patterns in the source. For example, Unlambda → As, Data, Its, Multi-parameter, Unlambda's Another extracted example is Unlambda → However, Input, More, There, When. Use these groups to spot repeated connection types before inspecting the individual relationships.

Unlambda

Top relations

related to Basic principles · 5
Unlambda → As, Data, Its, Multi-parameter, Unlambda's
related to Version 2 built-in functions · 5
Unlambda → However, Input, More, There, When
related to Original built-in functions · 4
Unlambda → Other, Similarly, The, Thus
Designed by · 1
Unlambda → David Madore
Developer · 1
Unlambda → David Madore
First appeared · 1
Unlambda → 28 June 1999; 27 years ago (1999-06-28)
Implementation language · 1
Unlambda → Scheme, C, Java
License · 1
Unlambda → GPL 2.0 or later
Paradigm · 1
Unlambda → Nearly pure functional
Stable release · 1
Unlambda → 2.0.0 / 20 December 1999; 26 years ago (1999-12-20)

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

functions applied function character argument operator functional input result expression language pure current continuation evaluated evaluation variables built-in also program

Unlambda relationships Subject–Predicate–Object triples

TTTA extracted 24 structured relationships around Unlambda. Examples in this analysis include Unlambda → Designed by → David Madore and Unlambda → First appeared → 28 June 1999; 27 years ago (1999-06-28). The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
UnlambdaDesigned byDavid Madore1.00infobox
UnlambdaDeveloperDavid Madore1.00infobox
UnlambdaFirst appeared28 June 1999; 27 years ago (1999-06-28)1.00infobox
UnlambdaImplementation languageScheme, C, Java1.00infobox
UnlambdaLicenseGPL 2.0 or later1.00infobox
UnlambdaParadigmNearly pure functional1.00infobox
UnlambdaStable release2.0.0 / 20 December 1999; 26 years ago (1999-12-20)1.00infobox
UnlambdaTyping disciplineUntyped1.00infobox
UnlambdaWebsitewww.madore.org/~david/programs/unlambda1.00infobox
Unlambdais aminimal0.90text
Unlambdarelated to Basic principlesAs0.60section
Unlambdarelated to Basic principlesIts0.60section

Related concept clusters Concept neighborhoods

The concept neighborhoods around Unlambda bring nearby vocabulary together. In this analysis, examples include Version, Applies and Combinator. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • original built-in functions
    • Gpl
    • Later
    • License
    • Operator
    • David
    • Free
    • Madore
    • Nearly
    • Pure
    • Unlambda
    • Also
    • Functions
  • functional programming language
    • Language
    • Programming
    • David
    • Madore
    • Nearly
    • Pure
    • Gpl
    • Later
    • License
    • Free
    • Unlambda
    • Also
  • esoteric programming language
    • David
    • Madore
    • Nearly
    • Pure
    • Language
    • Programming
    • Gpl
    • Later
    • License
    • Free
    • Unlambda
    • Also
  • free and open-source software
    • Gpl
    • Later
    • License
    • Madore
    • Nearly
    • Pure
    • Also
    • Built-in
    • Language
    • Programming
    • Variables
    • Version
  • pure
    • David
    • Madore
    • Language
    • Programming
    • Functional
    • Gpl
    • Later
    • License
    • Free
    • Unlambda
    • Also
    • Built-in
  • call with current continuation
    • Object
    • Function
    • Input
    • Value
    • Evaluated
    • Execution
    • Evaluation
    • Unlambda's
    • Continuation
    • Current
    • Expression
    • Result
  • lazy evaluation
    • Function
    • Execution
    • Input
    • Unlambda's
    • Value
    • Current
    • Evaluated
    • Operator
    • Result
    • Functions
    • Applied
  • eager evaluation
    • Function
    • Execution
    • Input
    • Unlambda's
    • Value
    • Current
    • Evaluated
    • Operator
    • Result
    • Functions
    • Applied

Connections between topic areas Semantic bridges

For Unlambda, one of the stronger structural bridges in this analysis connects Unlambda with Overview. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
UnlambdaOverview · splits 13 ⟂ 11
UnlambdaBasic principles · splits 18 ⟂ 6
UnlambdaOriginal built-in functions · splits 18 ⟂ 6

Map overview Semantic statistics

Unlambda

Nodes24
Edges23
Triples24
Avg. degree1.92
Density0.083333
Components1

Source & methodology

TTTA analyzes the structure around Unlambda to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Basic principles, Original built-in functions & Overview, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Unlambda · EN edition · Analysis: TopicsToTalkAbout

For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.