Factor 0.101 now available

12/10/2025 at 5:37:10 PM

Factor was the first language I ever 'played' with and it absolutely ruined me for every thing else (except maybe prolog and apl).

by Avshalom

12/10/2025 at 8:34:48 PM

I'm really impressed by Factor. It has a lot of the niceties that I like about Common Lisp, like restarting on errors and the compiled-but-interactive development approach. On top of all of this the development environment is presented as a very cohesive package, including standardized project structuring styles, a documentation system and a UI library.

The last time I tried to learn it I stopped because I found the concatenative syntax even harder to parse than s-exprs when any math was involved. I'm giving it another go now.

by v9v

12/10/2025 at 10:24:55 PM

https://docs.factorcode.org/content/word-%5Binfix%2Cinfix.ht...

by Avshalom

12/11/2025 at 8:09:03 AM

I suppose https://docs.factorcode.org/content/article-infix.html is actually the better link.

by Avshalom

12/11/2025 at 6:52:40 AM

Thanks! I didn't know it was possible to use infix notation.

by v9v

12/11/2025 at 10:28:00 AM

I played with factor for a while in 2009 and loved the language. I hung out in the #concatenative irc channel for a few months with many of the factor devs.

I stopped using it because it was a bit too niche, I realised I’d likely never get to use it in any serious context, and instead I learned a slightly less niche but still niche Clojure.

I don’t regret the switch at all and have learned a lot from Clojure, and used it extensively for over a decade. Lately I’ve moved away from it though. Mostly to typescript, a little rust, and Gleam, which is an absolute joy to use.

I still have a soft spot for Factor and am happy to se wits still worked on. It was one of the most interesting languages I at one point played with.

by dkersten

12/10/2025 at 6:17:26 PM

The OP link is overwhelmed. You can catch the release announcement on Planet Factor. https://planet.factorcode.org

by drob518

12/11/2025 at 4:05:26 AM

I got my start programming in Forth - we were making PC games for the Japanese market in the early 80s - Epson and Sharp machines... and Forth was just magic - I've missed it - must check Factor out!ppl interested in a concatenate audio synthesis DSL should check out SAPF https://github.com/lfnoise/sapf

by quaverquaver

12/10/2025 at 7:25:18 PM

I was wondering yesterday why it vanished.

Does anyone know if it supports inline assembly?

by fithisux

12/10/2025 at 7:38:25 PM

https://docs.factorcode.org/content/article-alien-assembly.h...

by Avshalom

12/11/2025 at 7:57:42 AM

Thank you

by fithisux

12/10/2025 at 7:33:05 PM

It's not something I've dabbled in but I think you could do something like that.

If you look at https://re.factorcode.org/2015/06/bit-test.html and the vocabularies it links over to I'm sure you'll be better able to figure it out.

Edit: This article says you can and shows how, https://re.factorcode.org/2010/11/estimating-cpu-speed.html .

by cess11

12/11/2025 at 7:57:49 AM

Thank you

by fithisux

12/11/2025 at 4:02:28 PM

Does anyone know of larger apps built using Factor? The closest I found is examples at https://www.concatenative.org/wiki/view/Factor

Are there non-trivial projects using the graphics? Games?

Is there a collection of awesome things built using Factor somewhere?

by akkartik

12/11/2025 at 9:56:11 PM

Years ago I built a website in Factor for testing HTML 5 video in browsers using the Theora codec. It allowed uploading videos, playing them in the browser, converting to Theora, transcoding YouTube videos, etc. It operated for a few years.

About the same time I wrote an 8080 emulator in Factor and emulated Space Invaders and a couple of other games using the Factor UI code.

For quite a while it was my go-to language for implementing things.

by doublec

12/11/2025 at 5:11:48 PM

> Does anyone know of larger apps built using Factor?

The Factor build farm, the website, and the concatenative wiki are all built in Factor, if that counts.

by slavapestov

12/11/2025 at 10:47:51 AM

Man, it would be helpful if they explained what a concatenative language actually was (maybe it's common knowledge?) - every link is just a page of other concatenative languages rather than an explanation.

by abrookewood

12/12/2025 at 4:43:33 PM

https://concatenative.org/wiki/view/Concatenative%20language

by fearmerchant

12/11/2025 at 12:24:53 AM

I haven't been paying attention to this, glad it's still going.

Reminds me I need to check on rebol/red and a few others.

by pragmatic

12/10/2025 at 5:08:37 PM

Factor supports ARM64 now? Nice.

by erichocean

12/10/2025 at 9:47:21 PM

Almost, but not quite yet. Hoping it comes in the next dev cycle.

by mrjbq7

12/10/2025 at 8:35:01 PM

Has there been any evolution on a type-system, even third-party?

by Pet_Ant

12/10/2025 at 9:52:52 PM

I wish it was available on Android, could be great on a phone.

by js8

12/11/2025 at 9:59:42 PM

Back in the days of Windows mobile (the old Windows phone, not the newer OS Microsoft made), Factor could run on some Windows phones: https://bluishcoder.co.nz/2007/02/17/factor-on-windows-mobil...

by doublec

12/11/2025 at 4:26:36 AM

Never heard of Factor but quite intriguing!

by rubenvanwyk