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alter-var-root-constantly-3
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| (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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