:: (a -> b) -> [a] -> b package:extra

Version on concatMap generalised to a Monoid rather than just a list.

mconcatMap Sum [1,2,3] == Sum 6
\f xs -> mconcatMap f xs == concatMap f xs

A strict version of sum, using a custom valuation function.

sumOn' read ["1", "2", "3"] == 6

A strict version of product, using a custom valuation function.

productOn' read ["1", "2", "4"] == 8

A generalization of sumOn' to Foldable instances.

A generalization of productOn' to Foldable instances.