lean-ja / lean-ja/lean-by-example
リストの Alternative 型クラスのインスタンスを紹介する
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コード例
データ型
型クラス
- Dominant language
- Lean
- Stars
- 188
- Forks
- 15
- Avg merge
- 9h 8m
- Merged PRs (30d)
- 6
Description
universe u
instance instAlternative : Alternative List.{u} where
failure := @List.nil
orElse l l' := List.append l (l' ())
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating the repository section where Lean type-class examples are documented; no target file or test is named in the issue. Add an introduction to the Alternative instance for List using the supplied example, and confirm that the documentation explains the instance and its behavior clearly.
Written by the indexing model from the issue text.
Assessment
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100