Re: [ANN] Clojure 1.9.0-alpha4

2016-06-04 Thread Martin Raison 
I support this change. Not only is it closer to the GIGO philosophy, but 
"let x in S" is actually a very reasonable use-case. Sometimes I just want 
an element from a set and I don't care about which particular one.

Your code may break if you're using try/catch to handle sets in a special 
way, but I can't imagine a situation where using clojure.core/set? wouldn't 
be simpler and more appropriate.

Le samedi 4 juin 2016 09:32:09 UTC-7, Atamert Ölçgen a écrit :
>
> Hi Alex,
>
> On Sat, Jun 4, 2016 at 3:22 PM, Alex Miller  > wrote:
>
>> Why?
>>
>
> Because unordered collections shouldn't have heads defined.
>
> Is (first #{3 1 2}) => 3? or 2? or 1?
>
> (I just tried it in a REPL and it is apparently 1.)
>
>  
>
>>
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>
>
> -- 
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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-04 Thread Atamert Ölçgen 
Hi Alex,

On Sat, Jun 4, 2016 at 3:22 PM, Alex Miller  wrote:

> Why?
>

Because unordered collections shouldn't have heads defined.

Is (first #{3 1 2}) => 3? or 2? or 1?

(I just tried it in a REPL and it is apparently 1.)



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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-04 Thread Nicola Mometto 
How is this a regression?

It doesn't cause any code that used to work to stop working.

The fact that tail destructuring now causes non-sequential collections to be 
destructured by sequential destructuring should be just considered an instance 
of GIGO and an implementation detail.

> On 4 Jun 2016, at 07:33, Atamert Ölçgen  wrote:
> 
> 
> 
> On Sat, Jun 4, 2016 at 9:28 AM,  <676c7...@gmail.com> wrote:
> This isn’t only an optimisation but also a change in behaviour, isn’t
> it?
> 
> Clojure 1.9.0-alpha3:
> 
> user=> (let [[x & xs] #{1 2 3}] x)
> UnsupportedOperationException nth not supported on this type: 
> PersistentHashSet  clojure.lang.RT.nthFrom (RT.java:948)
> 
> Clojure 1.9.0-alpha4:
> 
> user=> (let [[x & xs] #{1 2 3}] x)
> 1
> 
> I hope this will be considered a regression and the old behavior will be 
> restored.
> 
> 
> 
> Perhaps the documentation needs to be updated?
> http://clojure.org/reference/special_forms#_vector_binding_destructuring
> 
> 
> --
> David
> 
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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-04 Thread 'Alan Forrester' via Clojure 
What are you asking “Why?” about? You haven’t quoted anything so it’s not clear 
what you’re asking about.

Alan

On 4 Jun 2016, at 13:22, Alex Miller  wrote:

> Why?
> 
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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-04 Thread Alex Miller 
Why?

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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-04 Thread Atamert Ölçgen 
On Sat, Jun 4, 2016 at 9:28 AM, <676c7...@gmail.com> wrote:

> This isn’t only an optimisation but also a change in behaviour, isn’t
> it?
>
> Clojure 1.9.0-alpha3:
>
> user=> (let [[x & xs] #{1 2 3}] x)
> UnsupportedOperationException nth not supported on this type:
> PersistentHashSet  clojure.lang.RT.nthFrom (RT.java:948)
>
> Clojure 1.9.0-alpha4:
>
> user=> (let [[x & xs] #{1 2 3}] x)
> 1
>

I hope this will be considered a regression and the old behavior will be
restored.



>
> Perhaps the documentation needs to be updated?
> http://clojure.org/reference/special_forms#_vector_binding_destructuring
>
>
> --
> David
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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-04 Thread 676c7473 
This isn’t only an optimisation but also a change in behaviour, isn’t
it?

Clojure 1.9.0-alpha3:

user=> (let [[x & xs] #{1 2 3}] x)
UnsupportedOperationException nth not supported on this type: 
PersistentHashSet  clojure.lang.RT.nthFrom (RT.java:948)

Clojure 1.9.0-alpha4:

user=> (let [[x & xs] #{1 2 3}] x)
1

Perhaps the documentation needs to be updated?
http://clojure.org/reference/special_forms#_vector_binding_destructuring


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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-02 Thread Ghadi Shayban 
Let bindings from thbe macroexpansion of (let [[x & xs] v] ...)

;; old macroexpand
[G__1   v
 vec__2 G__1
 x  (nth vec__2 0 nil)
 xs (nthnext vec__2 1)]

;; new macroexpand
[G__6   v
 vec__7 G__6
 seq__8(seq vec__7)
 first__9  (first seq__8)
 seq__8(next seq__8)
 x first__9
 xsseq__8]

On Wednesday, June 1, 2016 at 7:49:00 PM UTC-4, Frank Castellucci wrote:
>
>
> 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 [_ 1000] 
>> (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 100))] 
>>   (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  
>> 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 
>> > 
>> > 
>> > -- 
>> > You received this message because you are subscribed to the Google 
>> > Groups "Clojure" group. 
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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-01 Thread Frank Castellucci 

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 [_ 1000] 
> (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 100))] 
>   (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  > 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 
> > 
> > 
> > -- 
> > You received this message because you are subscribed to the Google 
> > Groups "Clojure" group. 
> > To post to this group, send email to clo...@googlegroups.com 
>  
> > Note that posts from new members are moderated - please be patient with 
> your first post. 
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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-01 Thread Isaac Zeng 
That really cool

On Wednesday, June 1, 2016 at 10:17:14 PM UTC+8, 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 [_ 1000] 
> (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 100))] 
>   (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  > 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 
> > 
> > 
> > -- 
> > You received this message because you are subscribed to the Google 
> > Groups "Clojure" group. 
> > To post to this group, send email to clo...@googlegroups.com 
>  
> > Note that posts from new members are moderated - please be patient with 
> your first post. 
> > To unsubscribe from this group, send email to 
> > clojure+u...@googlegroups.com  
> > For more options, visit this group at 
> > http://groups.google.com/group/clojure?hl=en 
> > --- 
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>
>

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Re: [ANN] Clojure 1.9.0-alpha4

2016-06-01 Thread Rich Hickey 
To give people an idea of the update-in and seq destructuring improvements:

(let [d3 {:a {:b {:c 2}}}]
  (dotimes [_ 10]
(time (dotimes [_ 1000]
(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 100))]
  (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  
> 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
> 
> 
> -- 
> You received this message because you are subscribed to the Google
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> To post to this group, send email to clojure@googlegroups.com
> Note that posts from new members are moderated - please be patient with your 
> first post.
> To unsubscribe from this group, send email to
> clojure+unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/clojure?hl=en
> --- 
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[ANN] Clojure 1.9.0-alpha4

2016-05-31 Thread Stuart Halloway 
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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