JuliaLang/julia

make KeyIterator and ValueIterator more array-like

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#10,092 创建于 2015年2月5日

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 (9 评论) (3 反应) (0 负责人)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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developer experienceperformance
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
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1-3 hours
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stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Julia basicsunderstanding of iterators
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
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.