Augh, my eyes!
Seriously though, you can save yourself some pain. If you're going to
destructure in an anonymous function, just use (fn) instead of the now-
actually-longhand #() shorthand form:
(fn [[k v]] ...) vs #(let [[k v] %] ...) is clearer and doesn't stop
you using another #() nested within or without.
Related advice, which I always forget when I'm writing my own code, is
that you usually don't want to map an anonymous function; instead, use
for:
(for [[k v] my-seq]
(do-stuff-with k v))
is clearer than
(map (fn [[k v]] (do-stuff-with k v)) my-seq)
On Feb 22, 3:27 pm, Nurullah Akkaya <nurul...@nakkaya.com> wrote:
> You can use map to get your new sequence of pairs, the turn it into a
> hash-map using into,
>
> (->> {:first "john" :last "smith" :age 25}
> (map #(let [[k v] %]
> (if (string? v)
> [k (.toUpperCase v)] [k v])))
> (into {}))
>
> Best,
> --
> Nurullah Akkayahttp://nakkaya.com
>
> On Tuesday, February 22, 2011 at 5:08 AM, yair wrote:
> > I'm hoping this is a dumb question and I've missed something obvious.
> > I have a map with various key-value pairs and I want to transform some
> > of the values, e.g.
>
> > (def mymap {:first "john" :last "smith" :age 25}) and say I want to
> > change the strings to be upper case.
> > Right now all I can think of doing is using reduce and passing in an
> > empty map and the re-associating each key with the (possibly)
> > transformed value. Is there something like the map function that
> > takes two parameters, one a function that receives a pair and returns
> > a new pair, and the other a map, and returns a map that's
> > reconstituted from those pairs?
>
> > Thanks
>
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