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3 points by fallintothis 5124 days ago | link | parent

In def and mac parameter lists, they're pretty much never used.

  arc> (def destructuring (parm) (and (acons parm) (isnt (car parm) 'o)))
  #<procedure: destructuring>
  arc> (ratio [errsafe:some destructuring _] (vals sig))
  1/247
  arc> (keep [errsafe:some destructuring _] (vals sig))
  (((y m d)) ((y m d)))
They're most often used implicitly with let.

  $ grep "(let (" *.arc | grep -v "(let (unquote"
  app.arc:      (let (f url) afterward
  app.arc:                        (let (typ id val sho mod) it
  app.arc:  (let (nums (o label "")) (halve s letter)
  app.arc:         (let (ms ds ys) toks
  arc.arc:      (let (vars prev setter) (setforms place)
  arc.arc:    (let (binds val setter) (setforms place)
  arc.arc:    (let (binds val setter) (setforms place)
  arc.arc:    (let (binds val setter) (setforms place)
  arc.arc:    (let (binds val setter) (setforms place)
  arc.arc:    (let (binds val setter) (setforms place)
  arc.arc:        (let (binds val setter) (setforms place)
  arc.arc:        (let (binds val setter) (setforms place)
  arc.arc:    (let (binds val setter) (setforms place)
  arc.arc:  (let (y m d) (date s)
  arc.arc:  (let (binds val setter) (setforms place)
  html.arc:      (let ((opt val) . rest) options
  news.arc:             (let (t1 t2 t3 . rest) toks
  srv.arc:  (let (i o ip) (socket-accept s)
  srv.arc:                (let (type op args n cooks) (parseheader (rev lines))
  srv.arc:  (let (type op args) (parseurl (car lines))
  srv.arc:  (let (type url) (tokens s)
  srv.arc:    (let (base args) (tokens url #\?)
  srv.arc:      (let (kill keep) (split (rev fnids*) nharvest)