You can also memoize “expensive-calculation” …
https://clojuredocs.org/clojure.core/memoize
> On May 13, 2017, at 1:26 PM, Kevin Kleinfelter <kleinfelter.gro...@gmail.com>
> wrote:
>
> How would one convert the following procedural logic into functional/Clojure?
> x = expensive-calculation
> return (f1(x), f2(x), f3(x))
>
> I'm sure I could force it by using a var to save the intermediate value, but
> that's still procedural. It seems like the pattern of reusing an expensive
> result in multiple function calls without recalculating it must have a
> functional approach, but I'm not finding it.
>
> What I really want to do is to return:
> {:key1 f1(f0(x)), :key2 f2(f0(x)), :key3 f3(f0(x))}
>
> without paying the price of executing f0 multiple times.
>
> Tnx.
>
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