It is used as an "anonymous variable", when you don't care of a value:
user=> (let [myfn (fn [a b] (#(+ a b)))] (reduce myfn '(1 2 3 4 5))) 15 user=> (let [myfn (fn [a _] (#(+ a a)))] (reduce myfn '(1 2 3 4 5))) 16 On Thu, Nov 20, 2008 at 11:32 AM, Timothy Pratley <[EMAIL PROTECTED]>wrote: > >> >> > I didn't find any description of the symbol _ in the Clojure docs. >> > What is its exact status? Is it an ordinary symbol that is used by >> > convention for unused arguments? Or is it interpreted in a special >> > way by the reader or the compiler? >> >> Looks like it is just an ordinary symbol used by convention: >> >> user=> (def _ "fun") >> #=(var user/_) >> user=> _ >> "fun" >> >> user=> (defn x [_] _) >> #=(var user/x) >> user=> (x 1) >> 1 >> >> Ironic really, considering it is such a controversial character :) >> > > --~--~---------~--~----~------------~-------~--~----~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
