https://github.com/allo-media/canopy

A generic Tree API in Elm
https://github.com/allo-media/canopy

elm rosetree tree

Last synced: about 1 month ago
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A generic Tree API in Elm

• Host: GitHub
• URL: https://github.com/allo-media/canopy
• Owner: allo-media
• License: mit
• Created: 2018-05-04T08:23:28.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-05-28T13:03:49.000Z (over 5 years ago)
• Last Synced: 2023-08-08T20:37:49.506Z (over 1 year ago)
• Topics: elm, rosetree, tree
• Language: Elm
• Homepage: http://package.elm-lang.org/packages/allo-media/canopy/latest
• Size: 18.6 KB
• Stars: 11
• Watchers: 11
• Forks: 0
• Open Issues: 4
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
Canopy

======

A Generic Tree API, based on the [Rose Tree](https://en.wikipedia.org/wiki/Rose_tree)

algebraic data type, augmented with helpers for building, querying and manipulating nodes.

Building a tree is basically done with using `node` and `leaf`:

```elm

tree : Node String

tree =

    node "root"

        [ node "foo"

            [ leaf "bar" ]

        , node "baz"

            [ leaf "qux" ]

        ]

```

The API focuses on node values for common operations:

```elm

tree

    |> remove "baz"

    |> append "foo" "bingo"

    == node "root"

        [ node "foo"

            [ leaf "bar"

            , leaf "bingo"

            ]

        ]

```

It exposes powerful helpers for working with tree data structures:

```elm

node 1

    [ node 2

        [ leaf 3, leaf 4 ]

    , node 5

        [ leaf 6 ]

    ]

    |> flatMap (value >> (*) 2)

    |> List.sum

    == 42

```

License

-------

MIT.