Re: macro to unwrap a list
On Monday, 15 February 2016, Sonny To <son.c...@gmail.com> wrote: > I am trying to write a macro to unwrap a list: > > here's my naive attempt > > (defmacro unwrap [s] > (-> s pr-str (clojure.string/replace #"[\(\)]" "") read-string)) > > (unwrap (1 2 3) ) should give 1 2 3 > > any ideas how this can be done? > > thanks, > Sonny > As pther mentioned, you can't really do that with a macro. Depending on your use-case, though, you may find the "unquote splicing" ~@ operator useful. -- 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.
Re: macro to unwrap a list
A macro can't do this, it must return a single form. But the `apply` function can do something similar in the context of a function call. (apply foo '(1 2 3)) is the same as (foo 1 2 3) –S On Monday, February 15, 2016 at 2:05:52 PM UTC-5, Sonny To wrote: > > I am trying to write a macro to unwrap a list: > > here's my naive attempt > > (defmacro unwrap [s] > (-> s pr-str (clojure.string/replace #"[\(\)]" "") read-string)) > > (unwrap (1 2 3) ) should give 1 2 3 > > any ideas how this can be done? > > thanks, > Sonny > -- 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.
Re: macro to unwrap a list
What do you mean by "unwrap a list"? If you mean something where: (foo (unwrap 1 2 3)) == (foo 1 2 3) Then I'm afraid this can't be done. A macro returns a single data structure. - James On 15 February 2016 at 18:54, Sonny To <son.c...@gmail.com> wrote: > I am trying to write a macro to unwrap a list: > > here's my naive attempt > > (defmacro unwrap [s] > (-> s pr-str (clojure.string/replace #"[\(\)]" "") read-string)) > > (unwrap (1 2 3) ) should give 1 2 3 > > any ideas how this can be done? > > thanks, > Sonny > > -- > 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. > -- 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.
macro to unwrap a list
I am trying to write a macro to unwrap a list: here's my naive attempt (defmacro unwrap [s] (-> s pr-str (clojure.string/replace #"[\(\)]" "") read-string)) (unwrap (1 2 3) ) should give 1 2 3 any ideas how this can be done? thanks, Sonny -- 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.
