This is a good gotcha. From Clojure's perspective this is just referencing a Java field (which could be mutable and NOT a constant). Maybe it would be possible to reflectively determine that this field is actually a constant and make it work, not sure.
The number one special case I see people ask about with case though is Java class constants (which are *not* constants and don't work). One workaround is to use the class name as a string. On Wednesday, December 7, 2016 at 5:43:28 PM UTC-6, Ryan Fowler wrote: > > I love the idea. > > A gotchas section of some sort could be useful. For instance, a detail > about `case` to consider mentioning is that Java Constants don't work as > tests. > > ryans-mbp:~% cat test.clj > (let [incoming-character Character/LINE_SEPARATOR] > (println "case w/ constant" > (case incoming-character > Character/LINE_SEPARATOR :line-separator > :unknown)) > (println "case w/ int " > (case incoming-character > 13 :line-separator > :unknown))) > > ryans-mbp:~% java -jar $CLOJURE test.clj > case w/ constant :unknown > case w/ int :line-separator > > I think I understand why this doesn't work but it feels like it should > work. And without prior knowledge, I don't think I would assume that > constants don't work. > > Ryan > > > On Wed, Dec 7, 2016 at 4:57 PM, Alex Miller <a...@puredanger.com> wrote: > >> This is a cool idea so thanks for working on it. >> >> I was going to buy this (as I buy most of the Clojure books that come >> out) but $48 for an unfinished ebook put me off so I didn't. I totally get >> why a physical book of this length would be that much (because paper is >> expensive right now), but I don't get it with the ebook (particularly EA)? >> I know you likely have little control over this, so it's not really fair to >> complain to you, but maybe you can feed it back to your editor. >> >> While pretty thorough, that case description is still lacking a >> description of one important feature - grouping multiple tests that have >> the same output in a list. Basically this line from the doc string: >> >> (test-constant1 ... test-constantN) result-expr >> >> >> Example: >> >> (case 3 >> (1 2 3) "1, 2, or 3" >> 4 "4" >> (5 6 7) "5, 6, or 7") >> >> ;;=> "1, 2, or 3" >> >> I think most people are unaware of this feature and seems like it's the >> kind of thing you'd want in the book. >> >> Alex >> >> On Wednesday, December 7, 2016 at 12:14:29 PM UTC-6, Renzo Borgatti wrote: >>> >>> Hi all, >>> >>> I'm very happy to announce the early access of a new book: "Clojure >>> Standard Library - Annotated Reference" by Manning. Although it's a >>> reference of the roughly 700+ functions (and macros) coming out of the box >>> with the Clojure jar file, it is not designed to read as a boring list. >>> Think of all the Stackoverflow, mailing lists, ClojureDocs, articles, blogs >>> all mashed together to create an essay for each function. The book website >>> is: >>> >>> https://www.manning.com/books/clojure-standard-library >>> >>> It contains now a total of 4 chapters (around 200 pages) or ~30 >>> functions, starting with some of the most important available in the >>> standard library. Here's a sample of “case" how it appears on the book >>> http://tinyurl.com/hekc55u to give you an idea of the kind of treatment >>> they get. Needless to say any feedback is highly appreciated. Any question >>> please shout here, personally at reborg*at*reborg.net or on the book >>> forum. >>> >>> Regards, >>> Renzo >>> >> -- >> 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.
