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5 points by absz 6153 days ago | link | parent

Just because something is academic doesn't mean it's not worthwhile. For instance, map, keep, reduce, etc. are different if passed a function with side-effects. What happens if you give them a function which modifies the list as it's being traversed? A pathological example:

  arc> (= x (range 1 5))
  (1 2 3 4 5)
  arc> (map [do (= (cdr x) (cddr x)) _] x)
  (1 3 4 5)
  arc> x
  (1)
However, if map is passed a pure function, you can e.g. run one copy of the function on each core and run it in parallel.

And "dangerSet" is both non-Lispy and non-Arcy. It's non-Arcy because it's long. And it's non-Lispy because of that capital letter: danger-set would be marginally better. But nevertheless, pair? is shorter than is-pair, and (in my opinion) reads much more nicely.