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Should `localeCompare` return in `Effect`?

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难度
5/5
预计耗时
一周以上
新手友好度
25/100
Issue 类型
功能
描述清晰度
需要澄清
活跃度
停滞
领域
api

调研方向

Review Data.String.Common.localeCompare and the linked MDN localeCompare behavior, then compare them with the planned Intl bindings that accept a Locale argument. The issue is done only after the FFI/effect decision and intended API behavior are resolved; no file or test is named in the report.

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描述

localeCompare can return different output depending on locale. Example borrowed from MDN:

console.log("ä".localeCompare("z", "de")); // a negative value: in German, ä sorts before z
console.log("ä".localeCompare("z", "sv")); // a positive value: in Swedish, ä sorts after z

The FFI for Data.String.Common.localeCompare uses the system default locale, so Data.String.Common.localeCompare "ä" "z" could be LT or GT depending on if it's run in Germany or Sweden, for example.

It seems unlikely (maybe even impossible? I'm not sure) for a system's locale to change over the lifetime of a program, so maybe that is enough to consider localeCompare observationally pure?

I'm mostly just curious about the intuition for what makes FFI code "effect"-ful, as I have a library of bindings for the Intl object and I was planning on adding to it a localeCompare that accepted the Locale argument as well.

主要语言
PureScript
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76
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30 天内没有已合并 PR

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