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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. BOOlean  👻 🐶 🏳️‍🌈‏ @jamiebuilds 7 Sep 2017

      Async-await footgun pointed out to me last night by @bassjacob: Always `return await` or if you wrap with try-catch it won't be caughtpic.twitter.com/uwOvrnRKM0

      15 replies 106 retweets 370 likes
    2. Sam Saccone‏Verified account @samccone 7 Sep 2017
      Replying to @jamiebuilds @thejameskyle @bassjacob

      ughhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

      2 replies 0 retweets 7 likes
    3. Ben Lesh  🧢 🏋️‍♂️ 💻 🎨‏ @BenLesh 7 Sep 2017
      Replying to @samccone @thejameskyle @bassjacob

      Strange, it's like return causes scheduling the execution of the throws() call. I wonder if there's anything in the spec about that.

      1 reply 0 retweets 0 likes
    4. Ben Lesh  🧢 🏋️‍♂️ 💻 🎨‏ @BenLesh 7 Sep 2017
      Replying to @BenLesh @samccone and

      I feel like I saw @caitp88 and @wycats taking about something similar last week. Extra scheduling with thennables.. not the same, but still.

      1 reply 0 retweets 0 likes
      Yehuda Katz  🥨‏Verified account @wycats 7 Sep 2017
      Replying to @BenLesh @samccone and

      It's that throws() produces a rejected promise, which isn't turned into an error until someone awaits it.

      8:16 PM - 7 Sep 2017
      • 7 Likes
      • Hernan Rajchert Jasondt Oscar Funes Jason Miller 🦊⚛ @pluma@mastodon.social Highly Stateful Complex Device Ben Lesh 🧢🏋️‍♂️💻🎨
      2 replies 0 retweets 7 likes
        1. New conversation
        2. Mike North  🤯‏ @michaellnorth 8 Sep 2017
          Replying to @wycats @BenLesh and

          I think this only makes sense to me b/c I have students build a sync/await with a generator function. Easier to spot the yield vs return. 1/

          1 reply 0 retweets 0 likes
        3. Mike North  🤯‏ @michaellnorth 8 Sep 2017
          Replying to @michaellnorth @wycats and

          Once you hide all that ugly stuff, it’s easy to get lost again. 2/2

          1 reply 0 retweets 0 likes
        4. Yehuda Katz  🥨‏Verified account @wycats 8 Sep 2017
          Replying to @michaellnorth @BenLesh and

          I'm not claiming it's not a gotcha, but rather that it's intrinsic to the tradeoff that lets us have "sequential but not sync" w/o types

          1 reply 0 retweets 0 likes
        5. Yehuda Katz  🥨‏Verified account @wycats 8 Sep 2017
          Replying to @wycats @michaellnorth and

          but I think good linters (and type systems like TS) could help catch these kinds of bugs and should.

          1 reply 0 retweets 2 likes
        6. Jacob Bass‏ @bassjacob 8 Sep 2017
          Replying to @wycats @michaellnorth and

          One of the things I appreciate about @reasonml is the ability to insist a function deals with promises "correctly".

          2 replies 0 retweets 2 likes
        7. Yehuda Katz  🥨‏Verified account @wycats 9 Sep 2017
          Replying to @bassjacob @michaellnorth and

          fwiw rust has a similar facility (via must_use types and a high fidelity lint) that I think TSLint should integrate.

          1 reply 0 retweets 0 likes
        8. Jacob Bass‏ @bassjacob 9 Sep 2017
          Replying to @wycats @michaellnorth and

          that sounds really cool, though compiler > linter imo. keep meaning to find time to learn rust. wasm might be the final straw. or rocket.rs

          1 reply 0 retweets 0 likes
        9. Yehuda Katz  🥨‏Verified account @wycats 9 Sep 2017
          Replying to @bassjacob @michaellnorth and

          Rust lints passes are often part of the compiler. The difference is that there's a way to disable lints.

          2 replies 0 retweets 0 likes
        10. 10 more replies
        1. New conversation
        2. Ben Lesh  🧢 🏋️‍♂️ 💻 🎨‏ @BenLesh 7 Sep 2017
          Replying to @wycats @samccone and

          Ah. Yeah that makes sense. I missed that throws was an async function, I thought it was a plain function at first glance.

          1 reply 0 retweets 0 likes
        3. Yehuda Katz  🥨‏Verified account @wycats 7 Sep 2017
          Replying to @BenLesh @samccone and

          It's definitely a gotcha, but it's fallout of the sync/async split. Rust has a linter rule for this kind of case.

          1 reply 0 retweets 5 likes
        4. Yehuda Katz  🥨‏Verified account @wycats 7 Sep 2017
          Replying to @wycats @BenLesh and

          TLDR you can annotate a type as must_use and the linter will yell at you unless it gets assigned to a sink (or assigned to _)

          0 replies 0 retweets 4 likes
        5. End of conversation

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