They are equivalent when operating on lists, but not so when operating on vectors (peek = constant time last, pop = log time remove last element) or queues (peek = first, pop = remove first element returning a queue -- rest/next would return a seq).
Also, they refuse to work with non-list sequences (try (peek (range)) or (peek (cons :foo ())) at the REPL). In general, they operate on clojure.lang.IPersistentStack instances. (That's right, persistent queues implement IPersistentStack.) Cheers, Michał On 30 May 2013 06:43, Seven Hong <sir.seven.h...@gmail.com> wrote: > Hi all, > > Could some one explain what's the difference between first and peek, rest > and pop? For me it looks like they behave exactly same on sequences.. > > Thanks! > > Best, > > Seven Hong > > -- > -- > 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/groups/opt_out. > > -- -- 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/groups/opt_out.
