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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 26 Sep 2017

      1: Can a react person explain something to me? People say that higher order components are faster than render props because they avoid

      3 replies 3 retweets 8 likes
      Show this thread
    2. Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017

      2: allocating a closure. But the higher order component pattern does at least one (and usually more) allocations when it copies the props

      2 replies 1 retweet 5 likes
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      Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017

      3/3: am I miscounting the costs or what?

      6:02 AM - 26 Sep 2017
      • 1 Retweet
      • 2 Likes
      • Tian Davis [天] Phips Peter
      5 replies 1 retweet 2 likes
        1. Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017

          /cc @mjackson

          2 replies 0 retweets 0 likes
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        1. New conversation
        2. MICHAEL JACKSON in SF‏ @mjackson 26 Sep 2017
          Replying to @wycats

          The function allocation argument is a weak one. An extra component in your hierarchy is going to be at least as expensive!

          2 replies 0 retweets 2 likes
        3. Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017
          Replying to @mjackson

          I agree re allocations, but don't you have the same number of component either way? Mouse is there in both designs, no?

          1 reply 0 retweets 0 likes
        4. MICHAEL JACKSON in SF‏ @mjackson 26 Sep 2017
          Replying to @wycats

          Yep, my example doesn't illustrate this point very well. The difference is that it's not a decorator, so doesn't re-render the whole App.

          1 reply 0 retweets 0 likes
        5. Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017
          Replying to @mjackson

          fwiw I thought your talk was great! It motivates your design well, and gave me a crisper argument for Glimmer block params.

          2 replies 0 retweets 1 like
        6. Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017
          Replying to @wycats @mjackson

          TLDR what's a higher order function if your function can't take arguments. What kind of functional programming is this?

          1 reply 0 retweets 1 like
        7. MICHAEL JACKSON in SF‏ @mjackson 26 Sep 2017
          Replying to @wycats

          Interesting. Yes, it's a different type of functional programming IMO, and one that encourages indirection.

          1 reply 0 retweets 1 like
        8. MICHAEL JACKSON in SF‏ @mjackson 26 Sep 2017
          Replying to @mjackson @wycats

          Instead of putting things inline, we compose ahead of time. I call it "static" composition. It's different from dynamic nature of JSX.

          1 reply 0 retweets 0 likes
        9. Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017
          Replying to @mjackson

          Yeah. I bristled a little at that distinction, because Glimmer is very static but uses what you call "dynamic composition", but hey YOLO

          1 reply 0 retweets 1 like
        10. 2 more replies
        1. New conversation
        2. Jamie Gaskins‏ @jamie_gaskins 26 Sep 2017
          Replying to @wycats

          I’m not sure why people believe individual allocations = poor perf. Each render allocates thousands of throwaway objects.

          1 reply 0 retweets 1 like
        3. Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017
          Replying to @jamie_gaskins

          And many of them are optimized away!

          1 reply 0 retweets 1 like
        4. Jamie Gaskins‏ @jamie_gaskins 26 Sep 2017
          Replying to @wycats

          Amortization + optimization = it's fine, people :-)

          0 replies 0 retweets 0 likes
        5. End of conversation
        1. New conversation
        2. Phips Peter‏ @pspeter3 26 Sep 2017
          Replying to @wycats

          Yeah, hard to compare the allocation costs. My belief is that render functions do not allow receiving components to shouldComponentUpdate.

          1 reply 0 retweets 1 like
        3. Phips Peter‏ @pspeter3 26 Sep 2017
          Replying to @pspeter3 @wycats

          The render prop could close over variables that the child component cannot discern. Thus cannot accurately determine whether to re-render.

          1 reply 0 retweets 0 likes
        4. Phips Peter‏ @pspeter3 26 Sep 2017
          Replying to @pspeter3 @wycats

          That being said, I think we've actually gone overboard with shouldComponentUpdate and HOC for @asana.

          1 reply 0 retweets 0 likes
        5. Phips Peter‏ @pspeter3 26 Sep 2017
          Replying to @pspeter3 @wycats @asana

          I want to run a perf experiment to see what happens when we remove it.

          1 reply 0 retweets 0 likes
        6. Yehuda Katz  🥨‏Verified account @wycats 26 Sep 2017
          Replying to @pspeter3 @asana

          Ah! I wasn't thinking about this because Glimmer creates sCU automatically, so it handles the render prop case fine. Valid critique.

          0 replies 0 retweets 1 like
        7. End of conversation
        1. Thorsten‏ @Linus_Borg 26 Sep 2017
          Replying to @wycats

          Also wondering about this. Is a closure supposedly cheaper than a whole component instance?

          0 replies 0 retweets 0 likes
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