Consider that: (defn add [a b] (+ a b))
is expanded to (something like): (def add (fn [a b] (+ a b))) So the actual code that runs is an anonymous function, which is bound to the (global) var #'add -- the function itself has no name. dev=> (*macroexpand* '(*defn* *add* [a b] (*+* a b))) (def add (clojure.core/fn ([a b] (+ a b)))) dev=> (*defn* *add* [a b] (*+* a b)) #'dev/add dev=> add #object[dev$add 0x72f91c91 "dev$add@72f91c91"] So the value of add is an object, with type dev$add, a class that implements a bunch of things including clojure.lang.IFn and java.lang.Runnable and java.util.concurrent.Callable etc. The "name" of function is hard to get to, inside a function because of that. One way to figure that out at runtime is to dig into the stack, which you can get at by creating an exception and inspecting it: be aware that this is an expensive operation! dev=> (*defn* *add* [a b] #_=> (*let* [frame (*first* (*:trace* (*Throwable->map* (*ex-info* *""* {}))))] #_=> (*println* (demunge (*name* (*first* frame)))) #_=> (*+* a b))) #'dev/add dev=> (add 1 2) dev/add 3 dev=> demunge is what turns Clojure's generated classnames back into readable source names. The more important question is: why do you want the function's name inside the body? -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- https://corfield.org/ World Singles Networks, LLC. -- https://worldsinglesnetworks.com/ "Perfection is the enemy of the good." -- Gustave Flaubert, French realist novelist (1821-1880) On Wed, Apr 28, 2021 at 6:35 AM damon kwok <qq563066...@gmail.com> wrote: > > How get function name in body? > > (defn add [a b] > ;; how get "add" here? > (+ a b)) > > -- > 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. > To view this discussion on the web visit > https://groups.google.com/d/msgid/clojure/5c533ccf-ec0b-4c84-b759-851f1fe3b3can%40googlegroups.com > <https://groups.google.com/d/msgid/clojure/5c533ccf-ec0b-4c84-b759-851f1fe3b3can%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/clojure/CAD4thx93gtbitV20HNk9XBGF%2BkoDyCLYadNp32dvrOSQdpRN0w%40mail.gmail.com.