Thanks John,
I came up with this, which uses destructuring quite heavily and might
slow things down...
(reduce (fn [s [t1 t2 w3 v]] (assoc-in s [t1 t2 w3] (/ (count v) all))) {}
(for [[k1 v1] ems [k2 v2] v1 [k3 v3] v2] [k1 k2 k3 v3]))
is this what you meant?
Jim
On 03/04/13 19:54, John D. Hume wrote:
Destructure the map entry.
(for [[k vs] some-map, v vs] v) or whatever.
On Wed, Apr 3, 2013 at 1:44 PM, Jim - FooBar(); <jimpil1...@gmail.com> wrote:
Hi all,
I 've recently come across this idiom (instead of nested reduces - from
Christophe's blog post of course!)
(reduce f init (for [x xs, y x, z y] z)) ;;it took me a while to realise how
cool this is :)
I'm trying to do the same for reduce-kv (for nested maps) but doesn't quite
work...has anyone done this already? It comes down to 'seq' returning a
[k,v] vector when called on a map so the second nesting level will break
because it will find a keyword or something similar. any ideas?
Jim
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