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wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

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Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

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    1. Kat Marchán‏ @maybekatz Mar 23

      im v excited to be able to do thispic.twitter.com/B0IsL1OUhO

      43 replies 226 retweets 964 likes
    2. Yehuda Katz  🥨‏Verified account @wycats Mar 23
      Replying to @maybekatz

      Do you think this syntax fares better for nested stuff than the same syntax in destructuring. I used to be really enthusiastic about pattern matching but am worried at how much people (myself included!) find nested destructuring inscrutable.

      1 reply 1 retweet 20 likes
    3. Kat Marchán‏ @maybekatz Mar 23
      Replying to @wycats

      Can you clarify? This is meant to be reeeeally close to how current JS destructuring works. The difference is some extra matching-related syntax. Guards exist exclusively at the toplevel.

      2 replies 0 retweets 4 likes
    4. Kat Marchán‏ @maybekatz Mar 23
      Replying to @maybekatz @wycats

      I agree that deeply nested destructuring is a pain pretty much no matter what you do -- I think the utility of this is simplifying navigating 1- or 2-levels that often turn into `if` statements with stuff like `if (foo && http://foo.bar  && foo.baz === 1)` etc

      3 replies 0 retweets 7 likes
      Yehuda Katz  🥨‏Verified account @wycats Mar 23
      Replying to @maybekatz

      Yeah I think this example illustrates the one level use cases nicely. Would this syntax differentiate between undefined and missing? In other words, would a prop with undefined as a value match, while a missing prop wouldn't?

      7:48 PM - 23 Mar 2018
      • 1 Like
      • Iddan Aaronsohn
      1 reply 0 retweets 1 like
        1. New conversation
        2. Kat Marchán‏ @maybekatz Mar 23
          Replying to @wycats

          the short version: yes! Matcher keys mentioned makes their presence required (w/ .hasOwnProperty()). Primitive literals are (currently) matched `===`. Long version: I spent most of today writing up a rough implementaion + documenting a bunch of details:https://github.com/zkat/pattycake 

          1 reply 0 retweets 5 likes
        3. Yehuda Katz  🥨‏Verified account @wycats Mar 23
          Replying to @maybekatz

          I wonder if that could be a footgun with forwarded undefined (and inconsistent with defaults in destructuring: let { x: x = 1 } = { x: undefined } x // 1

          1 reply 0 retweets 2 likes
        4. Kat Marchán‏ @maybekatz Mar 23
          Replying to @wycats

          Idk. I hadn't looked too closely at what current destructing does. If undefined is what default values actually check against, that seems a better solution. Would you care to PR that? 💚 I'm heading to bed in a sec

          1 reply 0 retweets 2 likes
        5. Yehuda Katz  🥨‏Verified account @wycats Mar 23
          Replying to @maybekatz

          No problem! I can at least open an issue, depending on how hard the current language is to modify. Link?

          1 reply 0 retweets 1 like
        6. Kat Marchán‏ @maybekatz Mar 23
          Replying to @wycats

          Up the thread! I'm gonna see about replacing the existing match proposal with this one once I've incorporated some missing bits for the original and the champions give their blessing. If it works out that way 💚https://github.com/zkat/pattycake 

          1 reply 0 retweets 1 like
        7. Yehuda Katz  🥨‏Verified account @wycats Mar 23
          Replying to @maybekatz

          I was working with @bterlson on match a while ago. Is that the proposal you're talking about?

          1 reply 0 retweets 0 likes
        8. Kat Marchán‏ @maybekatz Mar 23
          Replying to @wycats @bterlson

          Yup! I'm working with him now on irc and he encouraged me to pick this up. I'm trying to make sure all the bits he wanted are there

          1 reply 0 retweets 3 likes
        9. Yehuda Katz  🥨‏Verified account @wycats Mar 23
          Replying to @maybekatz @bterlson

          Great! Excited that you'll be picking this up. It could use some dedicated effort pushing it.

          1 reply 0 retweets 4 likes
        10. 1 more reply

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