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(func set? (val)
(and
(list? val)
(not (dups val))))
(func pair? :bool (val)
(and
(list? val)
(eq? 2 (length val))))
(type :pair :{:any} pair?)
(func dups (lst :[:any])
(def out (list))
(not (empty? (drop-while lst
(if (in? _item_ out)
#false
(block
(redef out (append out _item_))
#true))))))
; dicts
(func dict? (val)
(and
(list? val) ; TODO should this be automatic?
(reduce and (map pair? val) #true)
(not (dups (map first val)))))
(type :dict :[:pair] dict?)
(func dict :dict () (list))
(func has? :bool (in :dict key)
(not (empty?
(filter (lambda (x) (eq? (first x) key)) in))))
(func get (d :dict key)
(last (first
(drop-while d
(not (eq? key (first _item_)))))))
(func set :dict (d :dict key val)
(if (has? d key)
(map (lambda (x) (if (eq? key (first x)) (list (first x) val) x)) d)
(append d (list key val))))
(func keys (d :dict) (map first d))
(func drop (d :dict key)
(filter (lambda (x) (not (eq? (first x) key))) d))
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