I despise this writing style. What is the point the author is trying to make? Define what a ur-language is up front, don't be so damn coy. This isn't much more than a list of interesting languages for some definition of interesting.
[1] https://www.theguardian.com/education/gallery/2015/jan/23/a-...
https://en.wiktionary.org/wiki/ur-
Jesus! I thought these navel gazing low effort language posts went out of favor in 2012.
I know all of these languages and Forth isn't foundational for anything we currently use, maybe the JVM because it has a stack if you really try and torture the definition. It is just a collection of languages so the author can look smart.
If they wanted to provide insight, they would demarcate how the semantics of computation are different from each of these languages. It doesn't even mention the power of Forth in being able to extend the language and runtime from within the language itself.
I'll see myself out.
The prefix isn't even used properly.
an ill-educated whiner, and uncalled for.