Hi Yves,
I guess it is because r/reduce calls r/reduce-kv (which is specific for
map), while r/fold it does not have such special handling
Filip
On Tuesday, January 14, 2014 4:43:10 PM UTC+1, Yves Parès wrote:
>
> Hello!
> When mapping and reducing a map, it seems arguments are passed differently
> to the function that is mapped depending on whether you reduce with
> r/reduce or r/fold:
>
> (r/fold +
> (r/map (fn [k v] (inc v)) {:a 4 :b 5}))
> But:
> (r/reduce +
> (r/map (fn [[k v]] (inc v)) {:a 4 :b 5}))
>
> The function r/mapped is the same each time, but if the return value of
> r/map is further reduce with r/fold, it received 2 arguments (key and
> value). However, if it is reduced with r/reduce, the fn is called with ONE
> pair [k v].
>
> Is that normal?
>
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