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Factor (programming language)

programming language

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Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionSep 21, 2026
Entity authorityQ1391724
Source-derived summary

Factor is a stack-oriented programming language created by Slava Pestov. It is dynamically typed, with automatic memory management, and powerful metaprogramming features. The language has a single implementation featuring a self-hosted optimizing compiler and an interactive integrated development environment. The Factor distribution includes a large standard library. It is free and open-source software with a BSD license.

History

Slava Pestov created Factor in 2003 as a scripting language for a video game. The initial implementation, now referred to as JFactor, was implemented in Java and ran on the Java virtual machine. Though the early language resembled modern Factor superficially in terms of syntax, the modern language is very different in practical terms and the current implementation is much faster.

The language has changed significantly over time. Originally, Factor programs centered on manipulating Java objects with Java's reflective programming (reflection) abilities.

Editorial summary

The public source identifies “Factor (programming language)” as programming language. This brief keeps that definition visible, then builds a research path around Factor, programming and language.

Editorial reviewA dependable orientation record for establishing vocabulary, names and a first evidence trail. The current lead gives the account dated anchors—2003—that can be checked directly. The linked authority record independently contributes the date 2003-01-01. Its value is orientation rather than verdict, with Factor, programming and language providing the first useful test.
Editorial analysis

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A short description can identify a subject without explaining its stakes. For “Factor (programming language)”, the useful work is to connect “programming language” to the records capable of establishing context and consequence.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 21, 2026. The linked authority identifier is Q1391724. 2 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2003.

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A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

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Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

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Source & attribution

This entry incorporates text from Factor (programming language)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.