#4517: Add Data.Functor.Backwards to transformers ---------------------------------+------------------------------------------ Reporter: r6 | Owner: Type: proposal | Status: new Priority: normal | Component: libraries (other) Version: 7.0.1 | Keywords: backwards Testcase: | Blockedby: Os: Unknown/Multiple | Blocking: Architecture: Unknown/Multiple | Failure: None/Unknown ---------------------------------+------------------------------------------ Data.Functor.Backwards is a wrapper for functors that allow Foldable, Traversable, and Applicative functors to be operated backwards. It is similar to Dual for Monoids. The Applicative instance runs effects in reversed order. The Foldable instance folds from right to left, The Traversable instance traverses from right to left. -- Russell O'Connor http://r6.ca/ ``All talk about `theft,''' the general counsel of the American Graphophone Company wrote, ``is the merest claptrap, for there exists no property in ideas musical, literary or artistic, except as defined by statute.''