swap! takes as its arguments the atom and the function to transition the state inside the atom. It implicitly calls the function on the state: (swap! data replace-value)
It also can accept trailing arguments too... https://www.conj.io/store/v1/org.clojure/clojure/1.8.0/clj/clojure.core/swap%21 On Tuesday, December 20, 2016 at 11:04:11 AM UTC-5, Rickesh Bedia wrote: > > I have > (def data {:headers ["A" "B" "C" "D"] > :rows [["1" "2" "3" "4"] ["5" "6" "7" "8"] ["9" "10" "11" > "12"]]}) > > And I have a function > (defn replace-value [struct] > (clojure.walk/prewalk-replace {"3" "hello"} (struct :rows))) > > When I do > (replace-value @data) > [["1" "2" "hello" "4"] ["5" "6" "7" "8"] ["9" "10" > "11" "12"]] > > which is what I am expecting. > > However I want to achieve this same result using swap! So I tried > #(swap! data (replace-value %)) > > but I get the error #object[user$eval1308$fn__1309 0x6caeefd7 > "user$eval1308$fn__1309@6caeefd7"] > > I don't know what this error means nor how to resolve it > -- 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.
