Learn something of a completely different paradigm than the usual — i.e. procedural, for example C and Basic, or you'd be just wasting your time, IMHO. From the top of my head, the forerunners of their own paradigm are the next — for all, there are decent, free implementations:
- functional, prefix: Lisp or Scheme (see the many recommendations in this thread)
- Object: Smalltalk (for example Squeak)
- Postfix, stack based: FORTH
- Logic: Prolog (SWI-Prolog)
- Somewhat related: expert systems (event triggered), for example CLIPS
As a nice generic language, which feels a bit like a descendant from both Smalltalk and Lisp, but with a more procedural-like syntax, take a look at Python.
I can also recommend to take a look at Dr. Dobbs' Journal, which every year brings out a normal issue around alternative programming languages, and occasionally, a dedicated special issue.
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