If your asking this as an exercise for manipulating clojure datastructure,
then a solution could be :
(def d {:apple "green", :cherry "red", :banana "yellow"})
(apply str (interpose "&" (map (fn [[k v]] (str (name k) "=" v)) d)))
Of course, there's more to URI than that, e.g. name and values should be
appropriately encoded => so for real world usage, I'd use whatever library
is already available in your context.
The idiomatic way above leverages higher order functions. It's generally the
more concise way.
Of course, it uses seqs under the cover : X seq objects for the innermost
map, X seq objects as a result of interpose, not to say X vectors creations
as the result of map applying (seq) to d (to be able to consume the map as a
seq of key/value pairs).
It could also be written
(apply str (interpose "&" (for [[k v] d] (str (name k) "=" v))))
which seems even more readable
But anyway, it would probably be considered premature optimization to use
recur in the first place. I generally tend to use recur in the first place
when I give up with finding a cleaner way to write code with higher order
functions.
2010/10/9 Paul <paul_bow...@yahoo.com>
> Hi all,
>
> I'm trying to parse a map unto a URI string, e.g:
>
> {:apple "green", :cherry "red", :banana "yellow"} into
> "apple=green&cherry=red&banana=yellow"
>
> I've almost got there by several routes, but is there a 'preferred'
> idiomatically correct way to perform this?
>
> What are the advantages of, say, using recursion over sequences?
>
> Many thanks,
>
> P.
>
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