I think you want complement, like (filter (complement odd?) ...)
Andy C <mailto:andy.coolw...@gmail.com>
August 21, 2014 at 2:01 PM
Hi,
I was wondering what is the nicest way to do filter-not in Clojure.
Here are 3 expressions:
user=> (filter #(apply = %) '([1 2] [1 1]))
([1 1])
user=> (filter #(apply not= %) '([1 2] [1 1]))
([1 2])
user=> (filter #(not (apply = %)) '([1 2] [1 1]))
([1 2])
First one is just a base filtering. Second is taking advantage of
having inverted predicate. Now let's assume that we have only a
"positive" predicate, hence we would have to invert it by hand. That
leads me to 3rd expression above.
I was wondering though is it is possible to somehow get "not" closer
to "=", so the fact that we invert it is more obvious ...
Is it possible to do that? Or perhaps there is an easier way to code
it up all together ?
Thx,
Andy
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