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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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    1. elsie d. soundsystem‏ @mountain_ghosts May 20
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      been helping someone with some JS and just realised the interaction between async/await and arrow function return semantics is quite bad

      3 replies 5 retweets 25 likes
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    2. elsie d. soundsystem‏ @mountain_ghosts May 20
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      (id) => put(url, data) // congrats you can await on this for the request to complete (id) => { put(url, data) } // race condition printer go brrr

      4 replies 7 retweets 31 likes
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    3. elsie d. soundsystem‏ @mountain_ghosts May 20
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      you won't get any feedback from the language that this is wrong, you just get race conditions that are hard to debug, because you put a brace around something

      3 replies 0 retweets 20 likes
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    4. elsie d. soundsystem‏ @mountain_ghosts May 20
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      this is really hard to spot

      2 replies 0 retweets 8 likes
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    5. elsie d. soundsystem‏ @mountain_ghosts May 20
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      especially if the put(...) call is multi-line and someone may have simply put it on a separate line from the =>, or surrounded it with parens, or with braces

      1 reply 0 retweets 5 likes
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    6. elsie d. soundsystem‏ @mountain_ghosts May 20
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      like, I saw this b/c I've spent a lot of time knowing what edges to look for in async JS code, but it's really unfriendly to beginners

      1 reply 0 retweets 10 likes
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    7. elsie d. soundsystem‏ @mountain_ghosts May 20
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      also, you can `await` non-promise values; `await x` is effectively `Promise.resolve(x).then(...)`. this masks a lot of bugs

      2 replies 3 retweets 15 likes
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    8. elsie d. soundsystem‏ @mountain_ghosts May 20
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      this problem with brace vs no-brace manifests with any other return type, but it'll usually be easier to spot b/c you'll call some method on the result, so if: fn = (id) => { value } then fn().foo() will give an exception: no method foo() for undefined

      1 reply 0 retweets 5 likes
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    9. elsie d. soundsystem‏ @mountain_ghosts May 20
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      async/await makes this harder to spot because it's maximally forgiving -- `await` accepts non-Promise values, which is to say, all values, without exception

      5 replies 1 retweet 11 likes
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    10. Jonas Schievink‏ @sheevink May 21
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      Replying to @mountain_ghosts

      Oof, Rust's IntoFuture trait goes in the same direction, not sure it's a good idea to add that after all

      2 replies 0 retweets 0 likes
      yosh‏ @yoshuawuyts May 21
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      Replying to @sheevink @mountain_ghosts

      We wouldn't `impl<T> IntoFuture for T` tho — that seems like it'd be the most equivalent to what JS does, but would also defeat the purpose of the trait entirely.

      12:41 PM - 21 May 2020 from Berlin, Germany
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      • elsie d. soundsystem
      2 replies 0 retweets 1 like
        1. elsie d. soundsystem‏ @mountain_ghosts May 21
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          Replying to @yoshuawuyts @sheevink

          yes right, x.await is only defined for x: IntoFuture whereas in JS it's defined for all x

          0 replies 0 retweets 0 likes
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        1. Jonas Schievink‏ @sheevink May 21
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          Replying to @yoshuawuyts @mountain_ghosts

          Yeah that's true

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