Re: Looking for an equivalent of reductions for reduce for ->
I'm not quite sure what you want to do here in the general case but.a few thoughts: -> is implemented as a macro, whereas reduce and reductions are functions. Depending on what you really want you may need a macro over a function. Note that reduce is picky about the reducing function it takes: it must be function of two arguments. This is very different from the operation of the threading macro (->). If you want to implement this as a function, you might look at the implementation of juxt or comp for ideas since they are HOFs (functions taking other functions as arguments). If functions f, g, and h all take one argument you can implement the specific example you show as: ((juxt f (comp g f) (comp h g f)) 1) For functions of one argument this could be generalized to take multiple arguments and return vectors of composed applications: (defn intermediates [fns] (let [f (fn [x] ((apply juxt (map #(apply comp (reverse (take %1 fns))) (range 1 (inc (count fns) x)) ] (fn [& xs] (map f xs)) )) (def f inc) (defn g [x] (* x 2)) (defn h [n] (+ n 5)) ((intermediates [f g]) 5) ;=> ([6] [12]) ((intermediates [f g h]) 5) ;=> ([6 12 17]) ((intermediates [f g h]) 5 7 9) ; each vector is [(f x) (g (f x)) (h (g (f x)))] ;=> ([6 12 17] [8 16 21] [10 20 25]) cheers, -tom On Sunday, March 1, 2015 at 2:16:06 PM UTC-7, Bill Allen wrote: > > Hopefully that makes sense. Let me illustrate. > > (reduce + [1 2 3 4]) > ;=> 10 > (reductions + [1 2 3 4) > ;=> (1 3 6 10) > > (-> 1 f g h) > ;=> (h (g (f 1))) > > I'm hoping to get a function that behaves like: > (--> 1 f g h) > ;=> ((f 1) (g (f 1) (h (g (f 1 > > Any ideas? > > Regards, > Bill > > -- 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/d/optout.
Re: clojure.core/Format Bug?
If I copy and paste your format s-exp into LT, I see the correct result, displayed correctly. Same for a plain lein repl using Clojure 1.6.0. I'm using LightTable 0.6.5, binary 0.8.4. (On OSX 10.8.5 using Java 1.7.0_60-ea-b12). HTH, -tom On Sunday, April 6, 2014 2:00:55 PM UTC-7, Paul Umbers wrote: > > Andy, thanks for your help. > > I've checked and the displayed result is different only in LightTable. > When I execute the format functions from a CLI REPL I get the correct > number of characters displayed. I've checked the LT issues and can't see > anything that matches, so I'll probably raise it as a Clojure plugin bug. > -- 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/d/optout.
Re: Questions about using error-kit
Thanks Luc and Mayank. I will chuck the monolithic contrib lib and check out Slingshot as an error-kit replacement. -t On Sunday, September 30, 2012 1:52:08 PM UTC-7, Luc wrote: > > Contrib has been separated into separate libs since 1.3 > > http://dev.clojure.org/display/design/Where+Did+Clojure.Contrib+Go > > Suggests to use slingshot. > > The are 1.3 compliant monolithic contrib versions out there but it's > better to move to > the new implementations. > > Luc P. > -- 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
Questions about using error-kit
I'm trying to learn something about error-kit and encountering some unexpected responses, as follows: Clojure 1.3.0 user=> (use 'clojure.contrib.error-kit) Warning: *handler-stack* not declared dynamic and thus is not dynamically rebindable, but its name suggests otherwise. Please either indicate ^:dynamic *handler-stack* or change the name. Warning: *continues* not declared dynamic and thus is not dynamically rebindable, but its name suggests otherwise. Please either indicate ^:dynamic *continues* or change the name. nil user=> (def tm (throw-msg java.lang.IllegalArgumentException)) #'user/tm user=> (tm "hi") IllegalArgumentException sun.reflect.NativeConstructorAccessorImpl.newInstance0 (NativeConstructorAccessorImpl.java:-2) First, note the dynamic variable warnings upon use...(might this possibly indicate an out-of-date version of error-kit (I'm using using clojure-contrib.jar from 1.2.0)?). I'm just starting with error-kit but I would have expected that the last call (involving a previous throw-msg function) would have returned something like this: -> java.lang.IllegalArgumentException: hi and would not have included the additional junk from 'sun.reflect.NativeConstructor'. Is this some OSX Java bug or does this also happen on other JDKs? Any help or suggestions appreciated. -t -- 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
