Elegant Error Handling with the JavaScript “Either” Monad

Re:Elegant Error Handling with the JavaScript “Either” Monad by leshow on Wednesday June 19, 2019 @06:30PM (#20228000)

I'm not sure which definition you're referring to, but every one I've seen you'd be hard-pressed to use left as the 'good' value. The type's definition favours 'right' for Functor/Applicative/Monad/etc instances.

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Re:Elegant Error Handling with the JavaScript “Either” Monad by seppel on Wednesday June 19, 2019 @07:05PM (#20228230)

I'm referring to this comment: https://news.ycombinator.com/item?id=20224097

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Re:Elegant Error Handling with the JavaScript “Either” Monad by leshow on Wednesday June 19, 2019 @07:09PM (#20228253)

There are zero implementations of Left being the Ok value, just this hypothetical put forward by another commenter.

edit: I should specify that I mean when Either is used as a 'Result' type. There are plenty of other use cases you can use Either outside of Ok/Err values.

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