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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
      Yehuda Katz  🥨‏Verified account @wycats Mar 23
      Replying to @maybekatz

      I mean that a lot of people are avoiding normal nested destructuring because it's hard to understand. My personal hypothesis is that my brain forgets which side of the `:` has the bound variable no matter how many times I try to train myself. I've seen people say this a lot.

      7:46 PM - 23 Mar 2018
      • 4 Likes
      • Tamzin Blake ⚧ Dan Levy register and vote! Kat Marchán
      1 reply 0 retweets 4 likes
        1. New conversation
        2. Kat Marchán‏ @maybekatz Mar 23
          Replying to @wycats

          🤔 I haven't run into that confusion myself, but it makes sense. Is it clearer when there's literals involves? (which is often the case w/ matching like this) i.e. match (x) { {foo: 1} => ... } (vs {foo: bar})

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

          Yeah it's clearer that way. The issue for me is stuff like: let { person: { name: n } } = contact; ^ it takes me some effort every time to remember that n is the variable being bound here.

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

          I wonder if there's any way to address that. I can see how the : might make people think "variable-value-is: <val>". Because Language™

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

          I think what we did in modules is pretty good but it came pretty late and we didn't retrofit destructuring: let { person: { name as n } } = contact For me, this is eminently more readable and clear, especially when syntax highlighted.

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

          I periodically fantasize about bringing this up even now, because it has another use that's not covered by existing syntax: let { person: { first, last } as p } = contact For the case where you want the whole object and components

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

          I'm proposing `var@123` in the bikeshed section, since that's what most pattern engines use.

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

          Rust has `@` to the left and it's ... Ok (no pun intended). I think it's not ideal to reuse the @ sigil (inside a class, it'll become hard to pick out this syntax vs decorators). We could reuse sigils in diff contexts, but I tend to feel that we should try to avoid if possible.

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

          As long as we have a way to do this kind of assignment, I'm cool with wherever the bikeshed goes. I still prefer @ for its terseness and how it allows plain matchers. I also suspect it's easier to read when you're binding a big obj ("everything after this" vs "everything before")

          1 reply 0 retweets 0 likes
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