On Apr 13, 11:34 pm, strattonbrazil <strattonbra...@gmail.com> wrote:
> I want to map a dictionary and do different things depending on the
> key. I was planning on using an if-clause, but I'm not sure how to
> compare symbols to strings.
>
> Something like
>
> (map (fn [k v] (if (== k "hello") ... ...) {:hello 1 :goodbye 2})
>
> How would I normally compare symbols and strings?
I recently discovered condp, which is good for doing the equivalent of
a switch statement and more:
(map
(fn [[k v]]
(condp = k
:a (* 2 v)
:b (* 3 v)))
{:a "foo" :b "bar"})
Notice also that you need to put the [k v] inside an additional pair
of brackets in order to destructure the key/value pair. Otherwise the
anonymous function would just expect two arguments, rather than
destructuring a single argument.
(keyword "foo") => :foo
(name :foo) => "foo"
-Jeff
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