Why Factor?

The Factor programming language combines powerful language features with a full-featured library. The implementation is fully compiled for performance, while still supporting interactive development. Factor applications are portable between all common platforms. Factor can deploy stand-alone applications on all platforms. Full source code for the Factor project is available under a BSD license.

• Screenshots: Mac OS X, Windows
• Learn more about Factor
• Get started programming with Factor
• Get answers to frequently-asked questions
• Read Factor reference documentation online
• Learn more about concatenative programming
• Report a bug

Most of the above links point to pages on the concatenative.org wiki.

Show me some code!

Factor belongs to the family of concatenative languages: this means that, at the lowest level, a Factor program is a series of words (functions) that manipulate a stack of references to dynamically-typed values. This gives the language a powerful foundation which allows many abstractions and paradigms to be built on top. Reload this page to see a random code example below.

USING: io kernel sequences
http.client xml xml.data xml.traversal ;

"http://factorcode.org" http-get nip string>xml
"a" deep-tags-named
[ "href" attr ] map
[ print ] each

See the example programs page on the wiki for more.