> but, I can't seem to do this with the 'inc' function:
>
> user=> (binding [inc (fn [y] (+ 2 y))] (inc 44))
> 45
>
> Why doesn't this work?
Because inc is inlined, and thus isn't mentioned when your binding
occurs.
(defn inc
"Returns a number one greater than num."
{:inline (fn [x] `(. clojure.lang.Numbers (inc ~x)))}
[x] (. clojure.lang.Numbers (inc x)))
Try this:
user=> (binding [inc (fn [y] (+ 2 y))] (apply inc [44]))
46
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