Re: fastest way to remove nils
No problem, however this nuance has broader implications than just this code snippet :) If you pass false and nil values to a library and expect them to be processed differently, you may end up with a big surprise. Luc > The difference between nil and false is really handy in some cases > and for many people removing nil (or keeping not-nil) values from a seq > is not removing falsy values. > > I just wanted to point out the issues that may arise from a blind use of > (filter identity [...]) ;) > > On Friday, October 26, 2012 4:36:16 PM UTC+2, Luc wrote: > > > I avoid making explicit distinctions between false and nil in my code. > > In Clojure a falsy value is either nil or false. > > > > In interop I ensure that null and false when returned in the upper layers > > are made consistent (including Boolean objects set to false). > > > > Too much potential trouble in my opinion to let this slip everywhere in > > your > > code, it's not semantically coherent with Clojure. > > > > Luc P. > > > > > > > Be careful with the (filter identity ...) which will also remove > > "falses" > > > from seqs. > > > (filter identity [nil 2 3 nil false true 4]) > > > => (2 3 true 4) > > > Since (identity false) and (identity nil) returns respectively false and > > > nil they are BOTH rejected by filter. > > > > > > This could do the trick: > > > (filter (comp not nit?) [nil 2 3 nil false true 4]) > > > => (2 3 false true 4) > > > > > > On Wednesday, November 17, 2010 2:37:16 AM UTC+1, Luc wrote: > > > > > > > user=> (time (filter identity [ nil 1 2 nil 4])) > > > > "Elapsed time: 0.053219 msecs" > > > > (1 2 4) > > > > > > > > user=> (time (remove nil? [ nil 1 2 nil 4])) > > > > "Elapsed time: 0.065092 msecs" > > > > (1 2 4) > > > > > > > > Choose the flavor your prefer... > > > > > > > > Luc P. > > > > > > > > Glen Rubin > wrote .. > > > > > What is the fastest way to remove nils from a sequence? > > > > > > > > > > I usually use the filter function, but I see there are other > > functions > > > > > like remove that should also do the trick. > > > > > > > > > > -- > > > > > 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 > > > > Luc P. > > > > > > > > > > > > The rabid Muppet > > > > > > > > > > > > > > -- > > > 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 > > -- > > Softaddicts> sent by ibisMail from > > my ipad! > > > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > 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 -- Softaddicts sent by ibisMail from my ipad! -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
The difference between nil and false is really handy in some cases and for many people removing nil (or keeping not-nil) values from a seq is not removing falsy values. I just wanted to point out the issues that may arise from a blind use of (filter identity [...]) ;) On Friday, October 26, 2012 4:36:16 PM UTC+2, Luc wrote: > I avoid making explicit distinctions between false and nil in my code. > In Clojure a falsy value is either nil or false. > > In interop I ensure that null and false when returned in the upper layers > are made consistent (including Boolean objects set to false). > > Too much potential trouble in my opinion to let this slip everywhere in > your > code, it's not semantically coherent with Clojure. > > Luc P. > > > > Be careful with the (filter identity ...) which will also remove > "falses" > > from seqs. > > (filter identity [nil 2 3 nil false true 4]) > > => (2 3 true 4) > > Since (identity false) and (identity nil) returns respectively false and > > nil they are BOTH rejected by filter. > > > > This could do the trick: > > (filter (comp not nit?) [nil 2 3 nil false true 4]) > > => (2 3 false true 4) > > > > On Wednesday, November 17, 2010 2:37:16 AM UTC+1, Luc wrote: > > > > > user=> (time (filter identity [ nil 1 2 nil 4])) > > > "Elapsed time: 0.053219 msecs" > > > (1 2 4) > > > > > > user=> (time (remove nil? [ nil 1 2 nil 4])) > > > "Elapsed time: 0.065092 msecs" > > > (1 2 4) > > > > > > Choose the flavor your prefer... > > > > > > Luc P. > > > > > > Glen Rubin > wrote .. > > > > What is the fastest way to remove nils from a sequence? > > > > > > > > I usually use the filter function, but I see there are other > functions > > > > like remove that should also do the trick. > > > > > > > > -- > > > > 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 > > > Luc P. > > > > > > > > > The rabid Muppet > > > > > > > > > > -- > > 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 > -- > Softaddicts> sent by ibisMail from > my ipad! > -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
I avoid making explicit distinctions between false and nil in my code. In Clojure a falsy value is either nil or false. In interop I ensure that null and false when returned in the upper layers are made consistent (including Boolean objects set to false). Too much potential trouble in my opinion to let this slip everywhere in your code, it's not semantically coherent with Clojure. Luc P. > Be careful with the (filter identity ...) which will also remove "falses" > from seqs. > (filter identity [nil 2 3 nil false true 4]) > => (2 3 true 4) > Since (identity false) and (identity nil) returns respectively false and > nil they are BOTH rejected by filter. > > This could do the trick: > (filter (comp not nit?) [nil 2 3 nil false true 4]) > => (2 3 false true 4) > > On Wednesday, November 17, 2010 2:37:16 AM UTC+1, Luc wrote: > > > user=> (time (filter identity [ nil 1 2 nil 4])) > > "Elapsed time: 0.053219 msecs" > > (1 2 4) > > > > user=> (time (remove nil? [ nil 1 2 nil 4])) > > "Elapsed time: 0.065092 msecs" > > (1 2 4) > > > > Choose the flavor your prefer... > > > > Luc P. > > > > Glen Rubin > wrote .. > > > What is the fastest way to remove nils from a sequence? > > > > > > I usually use the filter function, but I see there are other functions > > > like remove that should also do the trick. > > > > > > -- > > > 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 > > Luc P. > > > > > > The rabid Muppet > > > > > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > 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 -- Softaddicts sent by ibisMail from my ipad! -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
(filter (comp not nit?) [nil 2 3 nil false true 4]) -> (remove nil? [...]) On Fri, Oct 26, 2012 at 12:53 PM, kevin roth wrote: > Be careful with the (filter identity ...) which will also remove "falses" > from seqs. > (filter identity [nil 2 3 nil false true 4]) > => (2 3 true 4) > Since (identity false) and (identity nil) returns respectively false and nil > they are BOTH rejected by filter. > > This could do the trick: > (filter (comp not nit?) [nil 2 3 nil false true 4]) > => (2 3 false true 4) > > On Wednesday, November 17, 2010 2:37:16 AM UTC+1, Luc wrote: >> >> user=> (time (filter identity [ nil 1 2 nil 4])) >> "Elapsed time: 0.053219 msecs" >> (1 2 4) >> >> user=> (time (remove nil? [ nil 1 2 nil 4])) >> "Elapsed time: 0.065092 msecs" >> (1 2 4) >> >> Choose the flavor your prefer... >> >> Luc P. >> >> Glen Rubin wrote .. >> > What is the fastest way to remove nils from a sequence? >> > >> > I usually use the filter function, but I see there are other functions >> > like remove that should also do the trick. >> > >> > -- >> > 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 >> Luc P. >> >> >> The rabid Muppet > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > 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 -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
Be careful with the (filter identity ...) which will also remove "falses" from seqs. (filter identity [nil 2 3 nil false true 4]) => (2 3 true 4) Since (identity false) and (identity nil) returns respectively false and nil they are BOTH rejected by filter. This could do the trick: (filter (comp not nit?) [nil 2 3 nil false true 4]) => (2 3 false true 4) On Wednesday, November 17, 2010 2:37:16 AM UTC+1, Luc wrote: > user=> (time (filter identity [ nil 1 2 nil 4])) > "Elapsed time: 0.053219 msecs" > (1 2 4) > > user=> (time (remove nil? [ nil 1 2 nil 4])) > "Elapsed time: 0.065092 msecs" > (1 2 4) > > Choose the flavor your prefer... > > Luc P. > > Glen Rubin > wrote .. > > What is the fastest way to remove nils from a sequence? > > > > I usually use the filter function, but I see there are other functions > > like remove that should also do the trick. > > > > -- > > 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 > Luc P. > > > The rabid Muppet > > -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
On Thu, Nov 18, 2010 at 10:47 AM, Glen Rubin wrote: > So, it seems the way I was removing nils using filter was already the > best way. still nice to learn about the keep fn. thx! I don't know if we can conclude that yet. It seems to be fastest on one system with one combination of Java version, VM settings, and clojure version and non-fastest on another system with another combination of Java version, VM settings, and clojure version. -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
So, it seems the way I was removing nils using filter was already the best way. still nice to learn about the keep fn. thx! On Nov 17, 8:38 pm, Ken Wesson wrote: > On Wed, Nov 17, 2010 at 7:55 PM, Robert McIntyre wrote: > > So, just to be clear, > > > user> (def nil-seq (doall (interleave (repeat 1e5 nil) (repeat 1e5 > > "whatever"))) ) > > #'user/nil-seq > > > user> (time (doall (keep identity nil-seq))) > > "Elapsed time: 122.485848 msecs" > > > user> (time (doall (remove nil? nil-seq))) > > "Elapsed time: 149.71484 msecs" > > I have to run these all a few times before the times quit shrinking > (JITting being done). Then: > > user=> (time (do (doall (keep identity nil-seq)) nil)) > "Elapsed time: 70.24324 msecs" > nil > user=> (time (do (doall (remove nil? nil-seq)) nil)) > "Elapsed time: 40.47016 msecs" > nil > user=> (time (do (doall (filter identity nil-seq)) nil)) > "Elapsed time: 36.70256 msecs" > nil > > It seems on my system keep identity is actually almost twice as SLOW > as remove nil? and filter identity is slightly faster; filter identity > is almost exactly twice as fast as keep identity. Filter identity > does, of course, discard falses as well as nils, but when that's > acceptable it's worth knowing it's fastest. > > I wonder if the difference is that I'm using the -server vm? > > It's especially interesting, in light of the likelihood that identity > is probably compiling away to nothing when the JIT is done inlining > everything, that both the slowest and the fastest use identity. It > suggests that keep is inherently somewhat slow, in particular. -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
On Wed, Nov 17, 2010 at 7:55 PM, Robert McIntyre wrote: > So, just to be clear, > > user> (def nil-seq (doall (interleave (repeat 1e5 nil) (repeat 1e5 > "whatever"))) ) > #'user/nil-seq > > user> (time (doall (keep identity nil-seq))) > "Elapsed time: 122.485848 msecs" > > user> (time (doall (remove nil? nil-seq))) > "Elapsed time: 149.71484 msecs" I have to run these all a few times before the times quit shrinking (JITting being done). Then: user=> (time (do (doall (keep identity nil-seq)) nil)) "Elapsed time: 70.24324 msecs" nil user=> (time (do (doall (remove nil? nil-seq)) nil)) "Elapsed time: 40.47016 msecs" nil user=> (time (do (doall (filter identity nil-seq)) nil)) "Elapsed time: 36.70256 msecs" nil It seems on my system keep identity is actually almost twice as SLOW as remove nil? and filter identity is slightly faster; filter identity is almost exactly twice as fast as keep identity. Filter identity does, of course, discard falses as well as nils, but when that's acceptable it's worth knowing it's fastest. I wonder if the difference is that I'm using the -server vm? It's especially interesting, in light of the likelihood that identity is probably compiling away to nothing when the JIT is done inlining everything, that both the slowest and the fastest use identity. It suggests that keep is inherently somewhat slow, in particular. -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
So, just to be clear, user> (def nil-seq (doall (interleave (repeat 1e5 nil) (repeat 1e5 "whatever"))) ) #'user/nil-seq user> (time (doall (keep identity nil-seq))) "Elapsed time: 122.485848 msecs" user> (time (doall (remove nil? nil-seq))) "Elapsed time: 149.71484 msecs" --Robert McIntyre On Wed, Nov 17, 2010 at 5:57 AM, Steve Purcell wrote: > Miki writes: >> user=> (time (remove nil? (repeat 100 nil))) >> "Elapsed time: 0.079312 msecs" >> () >> user=> (time (filter identity (repeat 100 nil))) >> "Elapsed time: 0.070249 msecs" >> () >> >> Seems like filter is a bit faster, however YMMV > > > You're not timing the execution, just the construction of a lazy seq: > > user> (time (remove nil? (repeat 100 nil))) > "Elapsed time: 0.044 msecs" > () > user> (time (doall (remove nil? (repeat 100 nil > "Elapsed time: 772.469 msecs" > () > > -Steve > > > > > >> >> On Nov 16, 4:48 pm, Glen Rubin wrote: >>> What is the fastest way to remove nils from a sequence? >>> >>> I usually use the filter function, but I see there are other functions >>> like remove that should also do the trick. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > 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 -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
Miki writes: > user=> (time (remove nil? (repeat 100 nil))) > "Elapsed time: 0.079312 msecs" > () > user=> (time (filter identity (repeat 100 nil))) > "Elapsed time: 0.070249 msecs" > () > > Seems like filter is a bit faster, however YMMV You're not timing the execution, just the construction of a lazy seq: user> (time (remove nil? (repeat 100 nil))) "Elapsed time: 0.044 msecs" () user> (time (doall (remove nil? (repeat 100 nil "Elapsed time: 772.469 msecs" () -Steve > > On Nov 16, 4:48 pm, Glen Rubin wrote: >> What is the fastest way to remove nils from a sequence? >> >> I usually use the filter function, but I see there are other functions >> like remove that should also do the trick. -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
Re-oups, Clojure 1.0 to 1.2 upgrade glitch :) Mark Engelberg wrote .. > (keep identity l) is preferable to (filter identity l) > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > 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 Luc P. The rabid Muppet -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
Oups.. :) Stuart Campbell wrote .. > On 17 November 2010 12:37, wrote: > > > user=> (time (filter identity [ nil 1 2 nil 4])) > > "Elapsed time: 0.053219 msecs" > > (1 2 4) > > > > user=> (time (remove nil? [ nil 1 2 nil 4])) > > "Elapsed time: 0.065092 msecs" > > (1 2 4) > > > > Choose the flavor your prefer... > > > > Luc P. > > > > Those aren't exactly equivalent: > > user> (filter identity [1 2 false 3 nil 4]) > (1 2 3 4) > user> (remove nil? [1 2 false 3 nil 4]) > (1 2 false 3 4) > > Regards, > Stuart > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > 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 Luc P. The rabid Muppet -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
(keep identity l) is preferable to (filter identity l) -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
On 17 November 2010 12:37, wrote: > user=> (time (filter identity [ nil 1 2 nil 4])) > "Elapsed time: 0.053219 msecs" > (1 2 4) > > user=> (time (remove nil? [ nil 1 2 nil 4])) > "Elapsed time: 0.065092 msecs" > (1 2 4) > > Choose the flavor your prefer... > > Luc P. > Those aren't exactly equivalent: user> (filter identity [1 2 false 3 nil 4]) (1 2 3 4) user> (remove nil? [1 2 false 3 nil 4]) (1 2 false 3 4) Regards, Stuart -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
user=> (time (remove nil? (repeat 100 nil))) "Elapsed time: 0.079312 msecs" () user=> (time (filter identity (repeat 100 nil))) "Elapsed time: 0.070249 msecs" () Seems like filter is a bit faster, however YMMV On Nov 16, 4:48 pm, Glen Rubin wrote: > What is the fastest way to remove nils from a sequence? > > I usually use the filter function, but I see there are other functions > like remove that should also do the trick. -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
Re: fastest way to remove nils
user=> (time (filter identity [ nil 1 2 nil 4])) "Elapsed time: 0.053219 msecs" (1 2 4) user=> (time (remove nil? [ nil 1 2 nil 4])) "Elapsed time: 0.065092 msecs" (1 2 4) Choose the flavor your prefer... Luc P. Glen Rubin wrote .. > What is the fastest way to remove nils from a sequence? > > I usually use the filter function, but I see there are other functions > like remove that should also do the trick. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > 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 Luc P. The rabid Muppet -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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
