>>As a group, *1, *2, and *3 form (effectively) a small queue (not a stack as >>someone mentioned previously). It was me :)
On Jan 15, 3:00 pm, "Stephen C. Gilardi" <squee...@mac.com> wrote: > On Jan 15, 2009, at 7:28 AM, HB wrote: > > > Do *1 *2 *3 ... are saved in a built in sequence that we can inspect > > its contents? > > No, they are separate vars. Here's the code from the core of the read- > eval-print loop in clojure/src/clj/clojure/main.clj that shows how > they're updated: > > (let [input (read)] > (skip-if-eol *in*) > (let [value (eval input)] > (print value) > (set! *3 *2) > (set! *2 *1) > (set! *1 value))) > > As a group, *1, *2, and *3 form (effectively) a small queue (not a > stack as someone mentioned previously). If at any point, you want to > see all three together, you can evaluate an expression that puts them > all in a vector: > > Clojure > user=> :a > :a > user=> :b > :b > user=> :c > :c > user=> :d > :d > user=> [*1 *2 *3] > [:d :c :b] > > Note that evaluating the vector makes that the new "most recent > value": it causes a new "*1" to be pushed into the queue: > > user=> [*1 *2 *3] > [[:d :c :b] :d :c] > user=> > > --Steve > > smime.p7s > 3KViewDownload --~--~---------~--~----~------------~-------~--~----~ 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 clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
