as-> is meant to be used as the only threading form. In your example you'd want to replace the initial ->> with as->.
On Monday, February 18, 2013 9:04:55 PM UTC+1, vemv wrote: > > That extra parenses trick is neat, never thought of that! > > As for as->> being redundant - it could be considered so indeed, given > that as-> can be lambified: (->> [] (#(as-> % x (map inc x)))) - but > that's pretty damn ugly haha. If you were thinking something else, please > let me know. > > Thanks - Victor > > On Mon, Feb 18, 2013 at 8:44 PM, Marko Topolnik > <marko.t...@gmail.com<javascript:> > > wrote: > >> On Monday, February 18, 2013 5:40:51 PM UTC+1, vemv wrote: >> >>> >>> And neither can be solved by adding a lambda: >>> >>> (-> [[1 1 1] 2 3] (nth 0) #(map inc %)) ;; fail >>> >> >> Lambda does solve it, you are just missing the parens around the lambda: >> >> (-> [[1 1 1] 2 3] (nth 0) (#(map inc %))) >> >> >> >>> Clojure 1.5's as->, though, can come to the rescue. >>> >>> (-> [[1 1 1] 2 3] (nth 0) (as-> x (map inc x))) ;; cool >>> >>> Now, I only wish 1.5 came with as->> macro! Its implemetation is >>> trivial anyway. >>> >>> (->> [1 2 3] (as->> _ (nth _ 0))) >>> >>> Of course, for the given examples, using these "as" forms is overkill. >>> But if you've ever ended up writing large expressions (especially when >>> experimenting) which arbitrarily nest/interleave ->> and ->, using as-> and >>> as->> can provide a more sequential, structured alternative. >>> >>> Couldn't find any related discussion about the uses of as->, as its name >>> is unfriendly to Google/JIRA searches. Thoughts? >>> >> >> as-> is actually a generalization of both -> and ->>: you get to choose >> where to involve the previous result in each form. That is why as->> would >> be redundant. >> >> -Marko >> >> -- >> -- >> 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<javascript:> >> 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 <javascript:> >> 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 unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
