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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    1. Josh Burgess  🤔‏ @_joshburgess 15 Jan 2019
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      A hill I will die on: There is no good reason to use `async/await` in JS/TS/Flow. - Specialized to thenables, not overloadable due to wrapping vals in promises - Tries to mask declarative async code as procedural sync code - No perf benefits vs 3rd party Promise implementations

      16 replies 8 retweets 65 likes
    2. angelo  🦊‏ @AngeloGulina 15 Jan 2019
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      Replying to @_joshburgess

      angelo  🦊 Retweeted Mathias Bynens

      Some time ago there was this: https://twitter.com/mathias/status/1062000234203496449?s=21 … True? Not true?

      angelo  🦊 added,

      Mathias BynensVerified account @mathias
      🔥 JavaScript performance advice: 1. prefer `async`/`await` over hand-written promise code
 2. prefer native promises over userland implementations https://v8.dev/blog/fast-async  https://twitter.com/v8js/status/1062000102909169670 …
      2 replies 0 retweets 1 like
    3. Josh Burgess  🤔‏ @_joshburgess 15 Jan 2019
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      Replying to @AngeloGulina

      I've seen people talk about how V8 optimizes it, and I, admittedly, don't know much about that, but when I last checked I saw that Promise libs like Bluebird & Creed, and other async libraries, like Most (streams) are significantly faster than native promises. Wasn't even close.

      2 replies 0 retweets 2 likes
    4. Martin Valdes de Leon‏ @mvaldesdeleon 15 Jan 2019
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      Replying to @_joshburgess @AngeloGulina

      The gist of it is that every time you use `then` a new Promise object is created, even if it's in a `then` chain where that particular Promise itself is never assigned to anything. When you use async/await, V8 is able to optimize these "intermediate" Promise objects away.

      1 reply 2 retweets 6 likes
    5. Josh Burgess  🤔‏ @_joshburgess 15 Jan 2019
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      Replying to @mvaldesdeleon @AngeloGulina

      Does that really matter in practice though? I mean, if you start off with a library that's already much faster, like Bluebird or Creed, or skip promises altogether in favor of a fast streams library, does that async/await optimization make any meaningful difference?

      2 replies 0 retweets 1 like
      Mathias Bynens‏Verified account @mathias 15 Jan 2019
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      Replying to @_joshburgess @mvaldesdeleon @AngeloGulina

      The real-world benchmarks in the blog post seem to indicate that yes, this does indeed have a significant impact. Please read the blog post. +@MayaLekova @bmeurer

      4:41 AM - 15 Jan 2019
      • 5 Likes
      • Raphaël Saunier Nick Ribal @ 🇪🇸 Enrico Amir Mikhak Benedikt Meurer
      2 replies 0 retweets 5 likes
        1. New conversation
        2. Martin Valdes de Leon‏ @mvaldesdeleon 15 Jan 2019
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          Replying to @mathias @_joshburgess and

          The real-world benchmarks from the post show a ~50ms gain when switching from Promises to async/await. So, if you're looking to shed that last few ms off your request, then sure. But in most cases I've found in the real world, there are many other areas you'd optimize first.

          1 reply 0 retweets 1 like
        3. Mathias Bynens‏Verified account @mathias 15 Jan 2019
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          Replying to @mvaldesdeleon @_joshburgess and

          That’s the thing — I wouldn’t consider async/await an optimization, but rather a substantial readability improvement. It’s a nice extra that the perf is now on par or better than vanilla promises. In general, we should all focus on writing readable, idiomatic, modern JS.

          3 replies 1 retweet 3 likes
        4. 3 more replies
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        2. Josh Burgess  🤔‏ @_joshburgess 15 Jan 2019
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          Replying to @mathias @mvaldesdeleon and

          This doesn't address my larger point about it probably not mattering if you are already using a library that's significantly faster than native promises though.

          1 reply 0 retweets 0 likes
        3. Josh Burgess  🤔‏ @_joshburgess 15 Jan 2019
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          Replying to @_joshburgess @mathias and

          If you're already using something like Bluebird or Creed or a non-promise based async library that's significantly faster than native promises, are you really going to be concerned with this async/await optimization over plain promise code? Probably not...

          0 replies 0 retweets 0 likes
        4. End of conversation

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