Re: new learner question
Don't want to thank each of you individually - so to all who answered - Thank-you! On Monday, May 23, 2016 at 9:10:47 PM UTC-4, Phil Virgo wrote: > > I just starting to try and teach myself Clojure. Kindly let me know if > there is a more appropriate place I should post simple questions. > > > (def s '(1 1 1 4 99) > > (take-while #(= (first s) %) s) ; works fine: (1 1 1) > > (take-while #(= (first %) %) s) ; IllegalArgumentException Don't know > how to create ISeq from: java.lang.Long clojure.lang.RT.seqFrom > (RT.java:505) > > It appears as though "%" cannot be used within a nested function - but > this works > > (#(prn (+ 3 %) % ) 5) ; works fine: 8 5 > > Does anyone know what is the rule of statement construction being violated? > > ~thanks > -- 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: new learner question
> > > > Nope, that's fine. (Although you can't nest one anonymous function inside > another as then it would be ambiguous what % refers to.) > To further clarify when anonymous functions can't be nested: #(+ % (+ % (+ % (+ % ==> totally legal #(+ % (#(* 2 %) %)) ===> totally not legal In the first example, % is always the same. However, in the second example, the #() form tries to introduce a *new* function, which can't be nested with this syntax. However. #(+ % ((fn [x] (* 2 x)) %)) ===> totally fine. You can nest as many functions as you want if you write them as (fn [] ...) -- 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: new learner question
On Monday, May 23, 2016 at 8:10:47 PM UTC-5, Phil Virgo wrote: > > I just starting to try and teach myself Clojure. Kindly let me know if > there is a more appropriate place I should post simple questions. > This is fine! You might also enjoy the #beginners room on the http://clojurians.net/ Slack for live chat. > > > (def s '(1 1 1 4 99) > > (take-while #(= (first s) %) s) ; works fine: (1 1 1) > > (take-while #(= (first %) %) s) ; IllegalArgumentException Don't know > how to create ISeq from: java.lang.Long clojure.lang.RT.seqFrom > (RT.java:505) > The anon function here is being invoked on the first value, which is 1 so that function becomes: #(= (first 1) 1) And the error is that (first 1) is being passed a number rather than something seqable. > > It appears as though "%" cannot be used within a nested function > Nope, that's fine. (Although you can't nest one anonymous function inside another as then it would be ambiguous what % refers to.) > - but this works > > (#(prn (+ 3 %) % ) 5) ; works fine: 8 5 > here this turns into: #(prn (+ 3 5) 5) which is fine. Hope that helps! > > Does anyone know what is the rule of statement construction being violated? > > ~thanks > -- 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: new learner question
Your use of % is syntactically correct. However, think of what is happening in the second example. Every time take-while invokes your function #(= (first %) %), % is bound to an element of the list s. So, something like this would happen when take-while is checking the first element: (= (first 1) 1). The exception just means that the function "first" can only work on sequences. Numbers are not sequences. On Monday, 23 May 2016 18:10:47 UTC-7, Phil Virgo wrote: > > I just starting to try and teach myself Clojure. Kindly let me know if > there is a more appropriate place I should post simple questions. > > > (def s '(1 1 1 4 99) > > (take-while #(= (first s) %) s) ; works fine: (1 1 1) > > (take-while #(= (first %) %) s) ; IllegalArgumentException Don't know > how to create ISeq from: java.lang.Long clojure.lang.RT.seqFrom > (RT.java:505) > > It appears as though "%" cannot be used within a nested function - but > this works > > (#(prn (+ 3 %) % ) 5) ; works fine: 8 5 > > Does anyone know what is the rule of statement construction being violated? > > ~thanks > -- 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: new learner question
On May 23, 2016 at 6:10:46 PM, Phil Virgo (pwvi...@gmail.com) wrote: (take-while #(= (first %) %) s) ; IllegalArgumentException Don't know how to create ISeq from: java.lang.Long clojure.lang.RT.seqFrom (RT.java:505) Your problem is that take-while will call the predicate for each item in the collection ’s’. So you’re calling first on each item in s and you can’t call first on a number. Thus the error you got. —dan. -- 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.
new learner question
I just starting to try and teach myself Clojure. Kindly let me know if there is a more appropriate place I should post simple questions. (def s '(1 1 1 4 99) (take-while #(= (first s) %) s) ; works fine: (1 1 1) (take-while #(= (first %) %) s) ; IllegalArgumentException Don't know how to create ISeq from: java.lang.Long clojure.lang.RT.seqFrom (RT.java:505) It appears as though "%" cannot be used within a nested function - but this works (#(prn (+ 3 %) % ) 5) ; works fine: 8 5 Does anyone know what is the rule of statement construction being violated? ~thanks -- 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.
