When clojure reads this, it immediately evaluates `(+ 1 2)` => 3 so your
code looks like:
(def x 3)
So subsequent references to `x` just get the pre-computed value of 3 and
don't know how it was derived.
Alan
On Thu, May 11, 2017 at 9:58 AM, Kevin Kleinfelter <
[email protected]> wrote:
> If I write a def with a function call, such as:
> (def x (+ 1 2))
> and I use x a gazillion times in my code, does Clojure execute the
> function ("+" in this case) on each use?
>
> Clearly, with (+ 1 2) it doesn't really matter, but if it is an expensive
> function such as reading a file it is a big deal.
>
> Tnx
>
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