How can I apply multiple functions, each producing a single map, to a common parameter, then merge all results? Can this be improved?
(merge {} (podr root) (version root) (year root) (month root))
where root is the common argument and podr, version, year and month are the functions.
You can create a seq of functions and use map to apply each one to root:
(into {} (map #(% root) [podr version year month]))
Or, you can use juxt to achieve the same:
(into {} ((juxt podr version year month) root))
Both are more or less equal.
Map application over a list of functions.
E.g. in Haskell it would be:
> map (\f -> f 2) [(+1), (*2), (^3)]
[3,4,8]
Or, using ($) as f $ x = f x you can apply :
> map ($ 2) [(+1), (*2), (^3)]
[3,4,8]
Same approach in any language with first class functions and application.
