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davidrupp/gist:8ecce770be8cadc77f70

Last active August 29, 2015 14:19
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alter-var-root-constantly-3
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gistfile1.clj
(def thing 1)
; general form is
; (alter-var-root var-to-be-altered
; function-to-apply-to-old-value)
(alter-var-root #'thing inc) ; value of thing is now 2
; equivalently ...
(alter-var-root #'thing (fn [old-val] (inc old-val))) ; value of thing is now 3
; also equivalently ...
(alter-var-root #'thing #(inc %1)) ; value of thing is now 4
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