>> Basically, I want the clojure equivalent of a clisp atom. >> In clisp, atom is true for everything that is not a cons cell. >> The closest match I found is creating a macro that returns true for >> everything that is not a list: >> clisp: >> >> (atom 1) => true >> (atom '(1 2 3)) => false >> >> I hope that makes things clearer :) >> Andreas > > Sounds like you really just want > > (defn atom? [x] > (not > (or > (instance? java.util.Collection x) > (instance? java.util.Map x)))) > > which returns true for integers, strings, and pretty much any other > objects except lists, seqs, vectors, maps, sets, and the like (and > their mutable java.util counterparts).
Additional corner cases to consider: * nil * arrays * poorly-designed Java classes that are clearly collection-like but don't implement collection interfaces. I needed to make a decision for all these cases in order to implement clojure.data/diff. The function clojure.data/equality-partition can be used to check for atomness, but note the docstring: implementation detail and subject to change. What else can you tell us about your use case? Stu -- 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
