On Fri, Jan 9, 2009 at 9:27 PM, Greg Fodor <gfo...@gmail.com> wrote:
>
> Ok, this makes sense to me now. So, correct me if I'm wrong, but is it
> safe to say that when you see parentheses surrounding values in the
> REPL output, that indicates the presence of a sequence, not
> necessarily a list? Still a little bit odd since one could almost
> argue that if that's the case you should never see parenthesis in the
> output of the REPL, since that symbology I assume is 'inspired' by the
> reader's expected syntax and regular parens are used for list
> literals, but either way it seems consistent to me now.
One subtlety that I'm not sure has been made clear here is that by
default the REPL prints only a sort of approximation of the exact
collection type.
sorted-map, hash-map, array-map, struct, etc. objects all print like:
{:a 1, :b 2}
Both sorted-set and hash-set objects print like #{4 5 6}
And yes, list, queues, and other seqs print like (7 8 9)
I can only think of one kind of vector, unless you count
LazilyPersistentVectors, which I wouldn't, really. Count, that is.
This is done not to create confusion, but to keep what the REPL prints
from being confusingly detailed. If you want to see the specific
types of most of these things, you can do so by using *print-dup*:
user=> (binding [*print-dup* true] (prn (hash-map :a 1, :b 2)))
{:a 1, :b 2}
nil
user=> (binding [*print-dup* true] (prn (sorted-map :a 1, :b 2)))
#=(clojure.lang.PersistentTreeMap/create {:a 1, :b 2})
nil
I hope that helps paint a more coherent picture of what's going on.
--Chouser
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