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Rose (n-ary) trees with both upwards- (i.e. cached) and downwards-traveling (i.e. accumulating) monoidal annotations. This is used as the core data structure underlying the diagrams framework, but potentially has other applications as well.

Abstractly, a DUALTree is a rose (n-ary) tree with data of one type at leaves, data of another type at internal nodes, and two types of monoidal annotations, one travelling "up" the tree and one traveling "down".

For a bit of background and motivation, see the paper

Brent Yorgey. Monoids: Theme and Variations. Haskell Symposium, 2012.

To install,

    npm install
    bower install
    npm run build

Changelog

  • v0.0.2 Updated bower metadata and made component public.
  • v0.0.1 Initial release for use in higher-level libraries. Expect significant change.