7 Reducers and Transducers

7.1  Reducers

7.1.1  fold

7.1.2  reducer and folder

7.1.3  monoid

7.1.4  foldcat, cat and append!

7.2  Transducers

7.2.1  transduce

7.2.2  eduction

7.2.3  completing

7.2.4  cat

7.3  reduced, reduced?, ensure-reduced, unreduced