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
• Learn more about concatenative programming
• Get answers to frequently-asked questions
• Get started programming with Factor
• Read Factor reference documentation online

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: accessors smtp ;

<email>
    "john@foobar.com" >>from
    { "jane@foobar.com" } >>to
    "Up for lunch?" >>subject
    "At Tracy's." >>body
send-email

See the example programs page on the wiki for more.