COWSEL
COWSEL (COntrolled Working SpacE Language) is a programming language designed between 1964 and 1966 by Robin Popplestone. It was based on an RPN form of Lisp combined with some ideas from CPL.
| Developer | Burstall, Popplestone |
|---|---|
| First appeared | 1964 |
| Influenced by | |
| CPL, Lisp | |
| Influenced | |
| POP-2 | |
COWSEL was initially implemented on a Ferranti Pegasus computer at the University of Leeds and on a Stantec Zebra at the Bradford Institute of Technology; later, Rod Burstall implemented it on an Elliot 4120 at the University of Edinburgh.
COWSEL was renamed POP-1 during the summer of 1966 and development continued under that name from then on.
Example code
function member
lambda x y
comment Is x a member of list y;
define y atom then *0 end
y hd x equal then *1 end
y tl -> y repeat up
Note that keywords were also underlined in the original printouts. Popplestone used a Flexowriter with underscoring for syntax highlighting.
gollark: It's not centralized.
gollark: I think the blockchain provides nice properties like tamperproofing and ordering.
gollark: Probably, though?
gollark: That would kind of defeat the point.
gollark: I'm not sure how else you could do it, really, since the situation with cryptocurrencies is that you need some way to deterministically, mathematically, decentrally verify that the money actually does belong to a specific person.
References
- Technical report: EPU-R-12, U Edinburgh (Apr 1966)
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