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Understanding Rendering in React ♻ ⚛️

Mateo Garcia on January 31, 2021

Hey there! 👋🏼 I'm Mateo Garcia, I co-organize a community in Medellin, Colombia called React Medellin. This year I started a series of posts calle...
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supergentle

I think the heuristic algorithm's time complexity drops to O(n) with some constraints. reactjs.org/docs/reconciliation.ht...

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Mateo Garcia

You're right 🤔

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Adarsh Kumar Bhautoo

Great article!

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Mateo Garcia

Thank you, Adarsh :)

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vupadhayayx86

How Virtual DOM is mapped with Real DOM on the first Render? Isn't it time consuming to do all this conversion from JSX to JS and then create a virtual DOM and map it with the real DOM? I want to understand how initial render happens?

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Aral Roca

I have the doubt if the new Virtual DOM is created after or before re-rendering. According to the order of the processes it seems that first is the Virtual DOM and then the re-render, but I always thought it was the other way around, because how do you know what new elements the new Virtual DOM will have without doing the re-render? Thank you.

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dthakur001

NICELY EXPLAINED!!!

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Mateo Garcia

Thank youu :)

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Max • Edited

If anyone's interested, here's a more in-depth coverage of the process described in the article indepth.dev/posts/1008/inside-fibe...

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Prajwal Jain

Thank You for this Article!!Well framed!

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Alexander Melnik

Good job! Thank you for this article!)

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Mateo Garcia

Thank you, Alexander :)

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Killian Frappart

Perfectly explained and interesting topic! Well done 👏

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Mateo Garcia

Thank you for reading it, Killian :)

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Xuan Truong

thank you!

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Giles Smith

Great article. Nice succinct explanations!!!! Great for a newbie.

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Yariv Shamash

Super nice! and makes sense of it all.
Thanks :)

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Mateo Garcia

Thank you, Yariv!

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Navead Kazi

Easy to understand and knowledgeable article

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Mateo Garcia • Edited

Thank you, Navead!

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ameera-abed

thanks great job

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Ali Gulmaliyev

it is perfect

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sumeet sood

IN Reconciliation you said -
Upgrades within the element's children recreate all children

but we sknow that react updates only those part's of DOM that are required to be updated

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Radragonorama

Thanks for the helpful article!

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Devi

Thank you.its helpful