The #_ reader macro simply comments out the form, so it's a no op. Sent from phone, please excuse brevity. On Mar 26, 2012 10:23 AM, "László Török" <ltoro...@gmail.com> wrote:
> Hi, > > I'm trying to wrap my head around the role of the #_ macro and how it's > used in core.cljs. > > Can some explain, why it is used to prefix (throw.. ) in > (deftype EmptyList [meta] > ... > ... > > IStack > > (-peek [coll] nil) > > (-pop [coll] #_(throw (js/Error. "Can't pop empty list"))) > > or in > (deftype Vector [meta array] > ... > ... > > IIndexed > > (-nth [coll n] > > (if (and (<= 0 n) (< n (.-length array))) > > (aget array n) > > #_(throw (js/Error. (str "No item " n " in vector of length " (.-length > array)))))) > > but not in > > (deftype Vector [meta array] > ... > ... > > (-pop [coll] > > (if (> (.-length array) 0) > > (let [new-array (aclone array)] > > (. new-array (pop)) > > (Vector. meta new-array)) > > (throw (js/Error. "Can't pop empty vector")))) > > > there are other examples at ln 68, ln 127, ln 146 for other forms. > > Thx > > Las > > > -- > László Török > > -- > 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 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
