https://github.com/justinwoo/purescript-dango

A fun library for sized lists in PureScript 0.12 using Symbols
https://github.com/justinwoo/purescript-dango

purescript sized type-level

Last synced: 5 months ago
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A fun library for sized lists in PureScript 0.12 using Symbols

• Host: GitHub
• URL: https://github.com/justinwoo/purescript-dango
• Owner: justinwoo
• Created: 2018-05-24T18:59:16.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2018-05-24T19:01:13.000Z (about 8 years ago)
• Last Synced: 2025-05-16T15:50:25.629Z (about 1 year ago)
• Topics: purescript, sized, type-level
• Language: PureScript
• Homepage:
• Size: 1000 Bytes
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# PureScript-Dango

A fun library for sized lists in PureScript 0.12 using Symbols

![](https://i.imgur.com/zAAgsSN.jpg)

## Usage

```hs

main :: Effect Unit

main = do

  log "Empty"

  let (empty :: D.SizedList "" Int) = D.empty

  logShow empty

  log "Singleton"

  let

    -- inferred:

    -- (b :: SizedList "." Int)

    singleton

      = D.singleton 1

  logShow singleton

  log "toList of singleton"

  let list = D.toList singleton

  logShow list

  log "toList of singleton"

  let nonEmptyList = D.toList singleton

  logShow nonEmptyList

  log "head of singleton"

  let head = D.head singleton

  logShow head

  -- correct compile error:

  -- let head' = D.head empty

  log "tail of singleton"

  let

    -- inferred

    -- (tail :: SizedList "" Int)

    tail

      = D.tail singleton

  logShow tail

  -- correct compile error:

  -- let tail' = D.tail empty

  log "append two singletons"

  let

    -- inferred

    -- (append :: SizedList ".." Int)

    append

      = D.append singleton singleton

  logShow append

  log "Finished"

```