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davidrupp/gist:1ae6fa19a9ea5bae7b50

Last active August 29, 2015 14:19
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alter-var-root-constantly-4
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gistfile1.clj
(def thing 1)
(alter-var-root #'thing (fn [old-val] nil)) ; value of thing is now nil
; we don't really need to name the argument, because we don't use it
; but we *do* need to include it; otherwise we'll get an arity exception
(alter-var-root #'thing (fn [_] nil)) ; value of thing is now nil
; equivalently (kind of) ...
(alter-var-root #'thing (constantly nil))
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