On Apr 10, 12:14 am, Jason Wolfe <jawo...@berkeley.edu> wrote: ... > Namely, if a map already contains a given key, when you attempt to > assoc in a version of the key with new metadata this is not recorded. > It seems that the map always retains the original key: >... > Is this desired behavior? If so, is there a better way to change the > metadata on a key than first dissoc-ing it out and then assoc-ing it > back in again with new metadata?
Probably this is expected, since metadata is defined not to affect equality, and maps rely on equality semantics. I would recommend against storing metadata on map keys. In general, if the metadata matters for the "value" of an object, then it shouldn't be metadata. Some alternatives: 1) put the information directly in the map values; 2) store metadata on the map values; 3) use maps as keys. -Stuart Sierra --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
