How was this accomplished?
On Wednesday, June 1, 2016 at 10:17:14 AM UTC-4, Rich Hickey wrote:
>
> To give people an idea of the update-in and seq destructuring
> improvements:
>
> (let [d3 {:a {:b {:c 2}}}]
> (dotimes [_ 10]
> (time (dotimes [_ 10000000]
> (update-in d3 [:a :b :c] inc)))))
>
> ;;;;;;;;;;; 1.9 alpha3 ;;;;;;;;;;;;;;
> user=> "Elapsed time: 6489.189065 msecs"
> "Elapsed time: 6501.518961 msecs"
> "Elapsed time: 6479.994554 msecs"
> "Elapsed time: 6477.236659 msecs"
> "Elapsed time: 6490.542382 msecs"
> "Elapsed time: 6494.044657 msecs"
> "Elapsed time: 6475.188285 msecs"
> "Elapsed time: 6498.734628 msecs"
> "Elapsed time: 6486.312312 msecs"
> "Elapsed time: 6476.566904 msecs"
> nil
>
> ;;;;;;;;;;; 1.9 alpha4 ;;;;;;;;;;;;;;
> user=> "Elapsed time: 1613.631053 msecs"
> "Elapsed time: 1614.271583 msecs"
> "Elapsed time: 1607.393994 msecs"
> "Elapsed time: 1605.966032 msecs"
> "Elapsed time: 1605.731867 msecs"
> "Elapsed time: 1605.836779 msecs"
> "Elapsed time: 1617.090363 msecs"
> "Elapsed time: 1611.065741 msecs"
> "Elapsed time: 1611.249945 msecs"
> "Elapsed time: 1624.351585 msecs"
> nil
>
> (let [v (into [] (range 1000000))]
> (dotimes [_ 10]
> (time (dotimes [_ 10]
> (loop [[x & xs] v]
> (if xs
> (recur xs)
> x))))))
>
> ;;;;;;;;;;; 1.9 alpha3 ;;;;;;;;;;;;;;
> user=> "Elapsed time: 1531.858419 msecs"
> "Elapsed time: 1521.997662 msecs"
> "Elapsed time: 1499.931748 msecs"
> "Elapsed time: 1499.745901 msecs"
> "Elapsed time: 1496.63342 msecs"
> "Elapsed time: 1499.363234 msecs"
> "Elapsed time: 1506.309383 msecs"
> "Elapsed time: 1514.943316 msecs"
> "Elapsed time: 1534.90731 msecs"
> "Elapsed time: 1524.550125 msecs"
> nil
> ;;;;;;;;;;; 1.9 alpha4 ;;;;;;;;;;;;;;
> user=> "Elapsed time: 155.544283 msecs"
> "Elapsed time: 131.861647 msecs"
> "Elapsed time: 141.774727 msecs"
> "Elapsed time: 238.939786 msecs"
> "Elapsed time: 294.832594 msecs"
> "Elapsed time: 278.476703 msecs"
> "Elapsed time: 133.259029 msecs"
> "Elapsed time: 139.917267 msecs"
> "Elapsed time: 137.444001 msecs"
> "Elapsed time: 147.852057 msecs”
> nil
>
>
> The code now produced for [x & xs] style destructuring is now as good as
> the best first/next code you could write by hand, while the code produced
> for [x y z] destructuring of indexed items is the same (fast, indexed) as
> always.
>
> Rich
>
> > On May 31, 2016, at 11:41 AM, Stuart Halloway <stuart....@gmail.com
> <javascript:>> wrote:
> >
> > Clojure 1.9.0-alpha4 is now available.
> >
> > Try it via
> >
> > - Download:
> https://repo1.maven.org/maven3/org/clojure/clojure/1.9.0-alpha4
> > - Leiningen: [org.clojure/clojure "1.9.0-alpha4"]
> >
> > 1.9.0-alpha4 includes the following changes since 1.9.0-alpha3:
> >
> > - fix describe empty cat
> > - improve update-in perf
> > - optimize seq (&) destructuring
> >
> >
> > --
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