deleteWith function & friends
还没有人认领这个 Issue。
评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 35/100
- Issue 类型
- 功能
- 描述清晰度
- 基本清楚
- 活跃度
- 停滞
- 领域
- backend
调研方向
The issue provides a deleteWith example and links to purescript/purescript-arrays#167; no source files or tests are named. Read that linked issue and the array library’s existing findIndex and delete functions to understand the available APIs. Done means deciding which “with” functions belong in the library and implementing and testing the agreed set.
由索引模型根据 Issue 内容生成。
描述
A lot of functions like delete require an index. A lot of times that index was not stored (which would also get updated as the array would change) but has to be refound with findIndex. When you use findIndex and immediately after use delete you know you are guaranteed an index that is not out of bounds. Could "with" functions be added that do this?
deleteWith :: forall a. (a -> Boolean) -> Array a -> Maybe (Array a)
deleteWith pred array = map (\idx -> unsafeDeleteAt idx array) (findIndex pred array)
It would make sense to have the unsafe implementations for them available, at least internally in the array library https://github.com/purescript/purescript-arrays/issues/167
One could argue that if you do this you are better off using a Map. But i think people will want to use an array plenty of times anyway.
- 主要语言
- PureScript
- 星标
- 58
- 派生
- 70
- 平均合并
- 2 天 22 小时
- 30 天内合并 PR
- 1
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purescript/purescript-arrays 的其他 Issue
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purescript/purescript-arrays#246 ·
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`groupBy` has unexpected `l` argument for `a -> a -> Boolean` predicate可能重新可做 关联的 PR 已关闭且未合并。 未关闭
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type: enhancement
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