See: http://richhickey.github.com/clojure-contrib/def-api.html#clojure.contrib.def/defnk
On Apr 6, 2:25 pm, Sophie <itsme...@hotmail.com> wrote: > Please don't misunderstand this post - it is not asking for a change > of syntax, just trying to understand something. > > Clojure has chosen positional parameters (just like for Lisp, C, C++, > Java, Ruby, Python, Prolog, ...) > > Smalltalk composes a full method name from a prefix-name + named > parameters. > [obj] prefix key1: x key2: y key3: z > > The [obj] part above is an artifact of the single-dispatch model, and > is irrelevant to this discussion, so I'll leave it out from here on. > Importantly, the method name here is a composite: > #prefix:key1:key2:key3 > > This leads to remarkably readable function calls: > 1. (schedule project: p1 after: p2 before: p3 priority: 7) > ;; calls schedule:project:after:before:priority > vs. > 2. (schedule p1 p2 p3 7) > > Note that 1. in no way requires arbitrary ordering of keywords, maps, > de-structuring, etc. The positions are still fixed, just keyword- > prefixed. It's like taking the Clojure parameter list > (defn schedule > [project before after priority] ....) > and requiring those parameter names (or a formal version thereof which > is meant to be part of the interface) at the calling sites. > > An only-slightly-strained analogy would be only allowing %1 %2 for > formal parameters in all function bodies > (defn schedule [%1 %2 %3] > (.... stuff with %1 %2 ...)) > or > (deftype Person [name age]) > and then requiring > (1 joe) instead of (:name joe) > > Just curious > - what folks think of fixed-positional-keyword params > - whether it was considered for Clojure > > Thanks! -- 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 To unsubscribe, reply using "remove me" as the subject.
