Oke, then I hve to find out where to put the initial value. These two do not work :
(reduce (fn [counter] (inc counter)) 0 [1,2,3]) (reduce (fn [counter] (inc counter) 0 ) [1,2,3]) Op zaterdag 3 oktober 2015 23:34:20 UTC+2 schreef Moe Aboulkheir: > > Roelof, > > Unless supplied with an initial value, reduce will use the first value > from the collection you supply - every sequence which doesn't start with > "1" will give you the wrong answer. > > Take care, > Moe > > On Sat, Oct 3, 2015 at 9:40 PM, Roelof Wobben <wobben...@gmail.com > <javascript:>> wrote: > >> Hello, >> >> I have to make a function which counts a collection without using count. >> >> So I came up with this : >> >> (fn [coll] (reduce (fn [counter _ ] (inc counter)) coll))) >> >> it works well with coll is [ 1 2 3] >> >> but it fails with "Hello World" >> >> How can I improve my code to work in both cases. >> >> Please , do not only give the answer but rather explain how I can make >> this work. >> So I learn a lot and not do only a copy/paste. >> >> Roelof >> >> -- >> 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/d/optout. >> > > -- 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.
