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object RightFolded2

This monoid takes a list of values of type In or Out, and folds to the right all the Ins into Out values, leaving you with a list of Out values, then finally, maps those outs onto Acc, where there is a group, and adds all the Accs up. So, if you have a list: I I I O I O O I O I O the monoid is equivalent to the computation:

map(fold(List(I,I,I),O)) + map(fold(List(I),O)) + map(fold(List(),O)) + map(fold(List(I),O)) + map(fold(List(I),O))

This models a version of the map/reduce paradigm, where the fold happens on the mappers for each group on Ins, and then they are mapped to Accs, sent to a single reducer and all the Accs are added up.

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  12. def monoid[In, Out, Acc](trans: (Out) => Acc)(foldfn: (In, Out) => Out)(implicit arg0: Group[Acc]): RightFolded2Monoid[In, Out, Acc]
  13. def monoid[In, Out](foldfn: (In, Out) => Out)(implicit arg0: Group[Out]): RightFolded2Monoid[In, Out, Out]
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