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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. 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
    2. 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
    3. 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
    4. vjeux ✪‏ @Vjeux Mar 23
      Replying to @maybekatz @wycats

      Using match, this would look like if (match (foo) { {bar, baz: 1} => true undefined => false }) Would be handy to have a `matches` keyword: if (foo matches {bar, baz: 1})

      3 replies 1 retweet 12 likes
    5. Kat Marchán‏ @maybekatz Mar 24
      Replying to @Vjeux @wycats

      My feeling is that pattern matching often allows you to do away with these if/then/else checks in the first place. Returning true/false for matches feels like an antipattern. Instead: match (foo) { {bar, baz: 1} => { doStuff() more() } _ => _ }

      2 replies 0 retweets 5 likes
    6. Yehuda Katz  🥨‏Verified account @wycats Mar 24
      Replying to @maybekatz @Vjeux

      Rust has if-let, which is a combination of if and pattern matching, and it was a pretty early, very high-value feature (and I think morally equivalent)

      1 reply 0 retweets 5 likes
    7. Yehuda Katz  🥨‏Verified account @wycats Mar 24
      Replying to @wycats @maybekatz @Vjeux

      TLDR it's for the case where you want to write something like: match (expr) { { done: true, value: v } => (do something with v), _ => { /* noop */ } }

      1 reply 0 retweets 3 likes
    8. Kat Marchán‏ @maybekatz Mar 25
      Replying to @wycats @Vjeux

      I added a new section on potential future work that includes this (since I think there's enough meat to consider with this proposal as-is). Thanks for bringing it up! I actually think this is p great.https://github.com/zkat/proposal-pattern-matching/blob/master/README.md#if-match …

      1 reply 0 retweets 1 like
    9. Yehuda Katz  🥨‏Verified account @wycats Mar 25
      Replying to @maybekatz @Vjeux

      Yeah it's most definitely not part of v1. But good to keep in mind as a constraint as we're tossing around syntax :)

      1 reply 0 retweets 2 likes
    10. vjeux ✪‏ @Vjeux Mar 25
      Replying to @wycats @maybekatz

      By the way this proposal is different than mine. With matches the idea is to be an expression so that you can write if (a matches x && b matches y) but don’t want to capture variables. For context, I’m working on a new programming language and this was a very common pattern

      1 reply 0 retweets 2 likes
      Yehuda Katz  🥨‏Verified account @wycats Mar 25
      Replying to @Vjeux @maybekatz

      A decent amount of use cases for if-let are really if matches. But sometimes you do want to capture variables, no?

      8:20 AM - 25 Mar 2018
      • 1 Like
      • Iddan Aaronsohn
      1 reply 0 retweets 1 like
        1. New conversation
        2. vjeux ✪‏ @Vjeux Mar 25
          Replying to @wycats @maybekatz

          Yeah, then you can use if let or match

          1 reply 0 retweets 0 likes
        3. Yehuda Katz  🥨‏Verified account @wycats Mar 25
          Replying to @Vjeux @maybekatz

          if-let serves double duty as matches infix but just today I hit a case in rust where a matches infix would have been nice as sugar.

          0 replies 0 retweets 1 like
        4. End of conversation

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