hello,
what's the common idiom in functional programming regarding checking
the validity of arguments to functions. i think this is called
defensive programming vs contract programming.
for example:
;; this first version of foo checks the validity of arguments inside
foo
(defn foo [context arg]
(if (arg-valid? arg)
(change-context context arg)
context))
;; this version assumes that the caller of foo fulfills the
preconditions of foo
(defn foo
"Precondition: (arg-valid? arg)"
[context arg]
(change context arg))
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