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slightlylate's profile
Alex Russell
Alex Russell
Alex Russell
@slightlylate

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Alex Russell

@slightlylate

Chrome Project 🐡 & Web Standards TL; Blink API OWNER Named PWAs w/ @phae; probably making her ☕ DMs open. Tweets my own; press@google.com for official comms.

San Francisco, The Internet
infrequently.org
Joined December 2010

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    1. Rob Dodson‏ @rob_dodson 9 Feb 2018
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      Replying to @slightlylate @jaffathecake @gauntface

      I'm still a little confused about the microtasks executing between the two click handlers example. Is the idea that when one function finishes running it checks to see if any microtasks are enqueued, runs them, then moves on to the next function?

      1 reply 0 retweets 0 likes
    2. Rob Dodson‏ @rob_dodson 9 Feb 2018
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      Replying to @rob_dodson @slightlylate and

      for context, referring to this bit:https://youtu.be/cCOL7MC4Pl0?t=30m4s …

      1 reply 0 retweets 0 likes
    3. Rob Dodson‏ @rob_dodson 9 Feb 2018
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      Replying to @rob_dodson @slightlylate and

      the reason i'm confused is because it isn't quite at the point of yielding back to the event loop because we're still processing functions related to the same event. it's more like it's taking a breath between each function

      2 replies 0 retweets 0 likes
    4. Jake Archibald‏ @jaffathecake 9 Feb 2018
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      Replying to @rob_dodson @slightlylate @gauntface

      Microtasks run when JS finishes running, as in the JS stack goes from having something in it, to nothing. That happens between listeners when dispatching an event.

      1 reply 0 retweets 3 likes
    5. Jake Archibald‏ @jaffathecake 9 Feb 2018
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      Replying to @jaffathecake @rob_dodson and

      I see a lot of articles that say microtasks happen "in the next turn of the loop", which isn't right. Microtasks are more closely related to JS than the event loop.

      1 reply 0 retweets 3 likes
    6. Jake Archibald‏ @jaffathecake 9 Feb 2018
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      Replying to @jaffathecake @rob_dodson and

      Microtasks are also processed after each task, but generally you'll encounter them when the JS stack empties.

      1 reply 0 retweets 2 likes
    7. Alex Russell‏ @slightlylate 9 Feb 2018
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      Replying to @jaffathecake @rob_dodson @gauntface

      Right. Yielding back to the event loop *also* requires an empty stack, so that just falls out naturally.

      2 replies 0 retweets 0 likes
    8. Alex Russell‏ @slightlylate 9 Feb 2018
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      Replying to @slightlylate @jaffathecake and

      The code for this has nice comments that document what's going on: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/platform/bindings/Microtask.h?type=cs&l=41 …

      2 replies 0 retweets 4 likes
    9. Rob Dodson‏ @rob_dodson 9 Feb 2018
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      Replying to @slightlylate @jaffathecake @gauntface

      Thanks! I understood the stack bit after watching Jake's example again. I think mentally i imagined each handler was part of a larger stack, called by some uber handleAllTheClickThings process. And that process would have to finish before microtasks could run.

      1 reply 0 retweets 0 likes
    10. Rob Dodson‏ @rob_dodson 9 Feb 2018
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      Replying to @rob_dodson @slightlylate and

      but really each handler is an independent stack that gets built up, finishes, microtasks run, then the next handler goes and creates its stack, and eventually it's all empty and we yield back

      1 reply 0 retweets 1 like
      Alex Russell‏ @slightlylate 9 Feb 2018
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      Replying to @rob_dodson @jaffathecake @gauntface

      All the meat is here: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/dom/events/EventTarget.cpp?type=cs&l=682 …

      9:32 AM - 9 Feb 2018
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      • Jake Archibald James S. AJ Klein Rob Dodson
      0 replies 0 retweets 4 likes

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