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meanOf folded
and sumOf folded
so that the fold only happens once? That might go back to the idea of “meanOf” as the optic and then maybe there’s a way to compose the optics?
As for foldl-like functionality I'm not sure seems difficult since accumulator type leaks in type signatures. But could be possible.
Another problem is one frequently needs multiple passes over data to avoid precision loss. Numerically stable computation of variance requires computing mean first
foldOver
http://hackage.haskell.org/package/foldl-1.4.5/docs/Control-Foldl.html#v:foldOver to which you give any lens/prism/traversal, and a Fold from http://hackage.haskell.org/package/foldl-statistics
Color
has quite a bit more functionality, more type safety and is much-much faster than colour
. There is a benchmark section in the library in case you are curious to see for yourself. Also I couldn't find a repo where colour package is maintained, which I think is a serious drawback.