JuliaLang/julia

make KeyIterator and ValueIterator more array-like

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#10,092 建立於 2015年2月5日

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 (9 留言) (3 反應) (0 負責人)Julia (48,709 star) (5,773 fork)batch import
collectionshelp wanted

描述

When have d = Dict(:foo => 12.34, "bar" => 567) and you write keys(d) you get a Base.KeyIterator object, which is fast and cheap to construct from the dictionary d. You can write collect(keys(d)) to get an array of keys, but you have to do this unfortunately often. It would be a good self-contained project to add more array-like behaviors to KeyIterator and the corresponding ValueIterator types so that things like keys(d)[1] and values(d)[end] work as expected.

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領域
developer experienceperformance
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Julia basicsunderstanding of iterators
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
70
研究方向
Examine the current implementation of KeyIterator and ValueIterator in base/dict.jl. Understand how indexing is currently handled and what methods need to be added to support keys(d)[i] and values(d)[end]. Consider implementing getindex and similar array like methods while ensuring performance is not degraded. Check existing tests for these types and add new tests.