Ah, up to 8, yes. Funny:
user=> (def a {:a 1 :a 2 :a 3 :a 4 :a 5 :a 6 :a 7 :a 8})
#'user/a
user=> a
{:a 1, :a 2, :a 3, :a 4, :a 5, :a 6, :a 7, :a 8}
user=> (def a {:a 1 :a 2 :a 3 :a 4 :a 5 :a 6 :a 7 :a 8 :a 9})
#'user/a
user=> a
{:a 9}
Thank you. a.
On 8 Mrz., 09:23, Meikel Brandmeyer <m...@kotka.de> wrote:
> Hi,
>
> On Mar 8, 9:19 am, alux <alu...@googlemail.com> wrote:
>
> > if I put the same keyword in a map literal multiple times, it seems to
> > stay there somehow:
>
> > user=> {:a 1 :a 2 :a 3}
> > {:a 1, :a 2, :a 3}
>
> This is an optimisation for small maps: the keys are not checked for
> uniqueness. One has to distinguish array maps from hash maps. Array
> maps are like ye olde alists. For small maps this is faster than a
> real hash map. Clojure uses array maps for small map literals (up to
> eight keys, IIRC). Having duplicate keys in a map literal is usually
> considered a bug.
>
> There is a ticket however, that map literals rely to much on the
> reader. So maybe there might be a change here, but I'm not up to date
> with that discussion.
>
> Sincerely
> Meikel
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