https://github.com/sgraf812/elm-stateful

Library for conveniently working with stateful computations
https://github.com/sgraf812/elm-stateful

Last synced: 4 months ago
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Library for conveniently working with stateful computations

• Host: GitHub
• URL: https://github.com/sgraf812/elm-stateful
• Owner: sgraf812
• License: mit
• Created: 2015-06-22T17:18:52.000Z (about 10 years ago)
• Default Branch: master
• Last Pushed: 2015-06-22T19:48:37.000Z (about 10 years ago)
• Last Synced: 2025-01-19T15:52:15.020Z (6 months ago)
• Language: Elm
• Size: 121 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Stateful [![Build Status](https://travis-ci.org/sgraf812/elm-stateful.svg)](https://travis-ci.org/sgraf812/elm-stateful)

A small library with primitives for working with stateful computations. This is neat when trying to imitate mutable variables, for example random number seeds or just generating automatically incrementing ids like so:

```

nextId : Stateful Int Int

nextId =

  Stateful.get `Stateful.andThen` \id ->

  Stateful.put (id + 1) `Stateful.andThen` \_ ->

  Stateful.return id

threeIds : List Int

threeIds =

  fst <| Stateful.run

    (Stateful.sequence

      [ nextId

      , nextId

      , nextId

      ])

    3

-- threeIds = [3, 4, 5]

```

The advantage here is that we don't need to manually thread a counter variable in a let binding.