Generic mapN and zipN
還沒有人認領這個 Issue。
評估
- 難度
- 5/5
- 預估耗時
- 一週以上
- 新手友好度
- 30/100
- Issue 類型
- 功能
- 描述清晰度
- 基本清楚
- 活躍度
- 停滯
研究方向
Read the issue’s proposed map2–map10 and zip2–zip10 signatures, then inspect the existing zip implementation and the project’s typeclass conventions. Decide which abstraction can support the proposed generic operations and how Tuple and Tuple2 should differ; done means the API design and its supported types are agreed before implementation.
由索引模型根據 Issue 內容生成。
描述
Proposing we add these mapN functions, and make them available to more than just List.
map2 :: forall a b c f. Functor f => (a -> b -> c) -> f a -> f b -> f c
map3 :: forall a b c d f. Functor f => (a -> b -> c -> d) -> f a -> f b -> f c -> f d
...
map10 ...
We can then use the mapN functions to create zipN functions:
-- This already exists, but it would be nice to offer a more generic version:
zip :: forall a b f. Functor f => f a -> f b -> Tuple a b
zip = map2 Tuple
-- Likely needed to fill the gap between the seemingly-identical
-- (but actually different) `Tuple` and nested `Tuple2`.
zip2 :: forall a b f. Functor f => f a -> f b -> f (Tuple2 a b)
zip2 = map2 Tuple2
zip3 :: forall a b c f. Functor f => f a -> f b -> f c -> f (Tuple3 a b c)
zip3 = map3 Tuple3
...
zip10 :: ...
zip10 = map10 Tuple10
We probably need a different typeclass than Functor though. What about Zippable?
A motivation for adding these functions is to get closer to Elm's usability in this area:
https://package.elm-lang.org/packages/elm/core/latest/List#map2
- 主要語言
- PureScript
- 星號
- 61
- 分支
- 50
- 平均合併
- 2 天 6 小時
- 30 天內合併 PR
- 1
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- 送出 Pull Request，並在描述裡引用這個 Issue 編號。
purescript/purescript-lists 的其他 Issue
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ZipList is Bind未關閉
難度 4/5 3-5 天 新手友好度 35/100
purescript/purescript-lists#219 · 1 則留言 · 1 個 reaction ·
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難度 2/5 1-3 小時 新手友好度 48/100
purescript/purescript-lists#218 ·
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Data.List.NonEmpty.intersect and Data.List.NonEmpty.intersectBy throw when intersection empty可能已有人在做 @evaogbe 於 1066 天前認領。 未關閉good first issue type: bug
難度 4/5 3-5 天 新手友好度 1/100
purescript/purescript-lists#216 · 2 則留言 ·
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type: enhancement
難度 4/5 3-5 天 新手友好度 25/100
purescript/purescript-lists#197 · 1 則留言 ·
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type: enhancement
難度 5/5 一週以上 新手友好度 24/100
purescript/purescript-lists#194 · 5 則留言 ·
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