https://github.com/iodevs/elm-history

A history pattern for Elm
https://github.com/iodevs/elm-history

elm hacktoberfest

Last synced: 21 days ago
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A history pattern for Elm

• Host: GitHub
• URL: https://github.com/iodevs/elm-history
• Owner: iodevs
• License: other
• Created: 2018-10-02T19:21:56.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2018-10-05T12:33:57.000Z (about 6 years ago)
• Last Synced: 2023-08-08T20:39:25.717Z (over 1 year ago)
• Topics: elm, hacktoberfest
• Language: Elm
• Homepage:
• Size: 8.79 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# elm-history

This library helps with keeping history of states of your variables.

For example, you defined a width of some div (elm-css or style or ...) and

this width has been changed by user's action. After that you want to have

same width of div as before user's action.

Install package usually a way (elm-0.19):

```

elm install iodevs/elm-history

```

## Usage:

```haskell

import History exposing (History, create, forward, rewind, rewindAll)

boxWidth : History String

boxWidth =

    create "200px"

newBoxWidth =

    boxWidth

        |> forward "300px"  -- History "300px" ["200px"]

        |> forward "400px"  -- History "400px" ["300px", "200px"]

        |> forward "500px"  -- History "500px" ["400px", "300px", "200px"]

        |> rewind           -- History "400px" ["300px","200px"]

        |> rewindAll        -- History "200px" []

        |> current          -- "200px"

```