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Sep 25, 2020 - 11:53 PM - by ceptimus
I'm taking a break from the Dart programming language and playing with the Clojure language. Clojure is a modern Lisp, and Lisp is one of the oldest computer languages around - invented in 1958 - only Fortran is older.

I've no idea what I'm doing really - just blundering around till the thing compiles and runs. I've written a sudoku solver as a learning exercise. Here's part of it.

(defn rmk [p] ; puzzle
  (loop [q p r (knowns p)]
    (if (empty? r)
      (if (< (count (knowns p)) (count (knowns q)) 81)
        (rmk q) ;found some new knowns (but not yet found all 81) so run again
        q) ;return puzzle 
      (recur (rma q (links (first (keys r))) (first (vals r))) (rest r)))))
Clojure is pretty mind-bending because everything's immutable - there's no easy way to even have a loop variable that increments without using recursion. :chin:

Also, lots of parentheses.

I don't think I'll use Clojure seriously, but I may pick up a few concepts that will be useful when writing programs in other languages.
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Post-Trump Democracy
Sep 24, 2020 - 8:59 PM - by viscousmemories
It's hard for me to imagine a post-Trump future as we close in on a potential civil war, but the Democrats actually gave me a tiny glimmer of hope yesterday with H.R.8363. It's nice to fantasize about a timeline where there's a peaceful transition of power to the Democrats and all these loopholes Trump exploited are sewed up.

Fact Sheet
17 Replies | 383 Views
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