Expanding on what Jim said, you don't usually need to convert the keys of a
map into a set, because the map pretty much acts like a set of its keys if
you use contains?
For example, (contains? {:a 1, :b 2} :a) tests whether :a is among the set
of keys in the map.
I believe that clojure.set's union, intersection, and difference all work
out of the box on maps (acting as if they are sets of keys), but you should
do some testing and/or inspection of the source code to verify this,
especially on maps with nil or false values.
On Mon, Jul 1, 2013 at 12:37 PM, Jim - FooBar(); <[email protected]>wrote:
> On 01/07/13 20:02, Pablo Nussembaum wrote:
>
>> This is pretty strange behavior to me, why is the case that keys
>> function don't return a set like java?
>>
>
> It doesn't need to be, does it?...the map itself ensures that there are no
> duplicate keys anyway. I guess it's one of those 'less is more' cases...
>
> Jim
>
>
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