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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    yosh‏ @yoshuawuyts 27 Dec 2018
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    Hmm, when there's an enum (MyEnum) that has a possible empty variant, how would you prefer to encode this? I feel there's pros / cons to both approaches; not sure which is better.

    5:23 AM - 27 Dec 2018
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    • Stjepan Glavina tim ryan Nextdork Alberto Leal 🦑 Pascal
    6 replies 0 retweets 5 likes
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      2. Saoirse Shipwreckt‏ @withoutboats 27 Dec 2018
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        Replying to @yoshuawuyts

        It depends if there are uses where the empty variant is invalid or not

        1 reply 0 retweets 4 likes
      3. yosh‏ @yoshuawuyts 27 Dec 2018
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        Replying to @withoutboats

        In this case the empty variant would be valid. So I'm guessing encoding None as a member would work best for that?

        1 reply 0 retweets 1 like
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      1. mkawia‏ @mkawia 27 Dec 2018
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        Replying to @yoshuawuyts

        the first one, then you get .map for free

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      2. Nextdork‏ @saemg 27 Dec 2018
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        Replying to @yoshuawuyts

        I'd need to know the reason why it's empty. If it's an inescapable fact of the business logic, which means it's always a possibility then in the enum, otherwise if it's due to missing data or an occasionally optional input outside via an optional/maybe.

        1 reply 0 retweets 0 likes
      3. Jeremy Pierre‏ @j14159 27 Dec 2018
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        Replying to @saemg @yoshuawuyts

        Also are there semantics that can be conveyed beyond “empty”? Encoding the “why” of empty-ness.

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      4. End of conversation
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      2. electrified filth‏ @sadisticsystems 27 Dec 2018
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        Replying to @yoshuawuyts

        I've gone back and forth on this in sled's API over the years. Now I tend to nest familiar Result and Option types rather than combining them into a single new type when getting a value that might not exist using io. But empty variants are great as markers, state machines etc...

        1 reply 0 retweets 0 likes
      3. electrified filth‏ @sadisticsystems 27 Dec 2018
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        Replying to @sadisticsystems @yoshuawuyts

        Users expect to use Options for things that are optional. But if you're creating a new concept, go with empty variants.

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      2. Pascal‏ @killercup 27 Dec 2018
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        Replying to @yoshuawuyts

        Interesting question! I think I'd go with the Option first, because it let's me keep the handling of emptiness outside of the methods on the enum. For a neater API you can try to `impl ExtTrait for Option<MyEnum> {}` but it only goes so far.

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