I have a couple utility functions I use a lot for creating maps from
sequences and transforming one map to another. These are (poorly)
named mapmap and mapmapmap. (Yes I know the names are awful but I
have lived with them long enough that they've stuck.)
mapmap takes a key production function (optional - uses identity by
default), a value production function, and a source sequence.
(def c (range 5))
(mapmap #(+ 1 %) #(* 2 %) c)
-> {5 8, 4 6, 3 4, 2 2, 1 0}
More here:
http://tech.puredanger.com/2010/09/24/meet-my-little-friend-mapmap/
mapmapmap is similar but takes a map, not a sequence. It applies the
key function to transform the keys and the value function to transform
the values. So your request would be:
(mapmapmap #(if (string? %) (upper-case %) %) mymap)
Here's a gist with the definition of both:
https://gist.github.com/843292
Hope you find it useful...
Alex
On Feb 21, 9:08 pm, yair <yair....@gmail.com> 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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