7.18 How React Update DOM

How React Update the DOM PDF

1. render() is called
   to functional and class-based comps
   doesn't immediately update the "real" DOM

   1. shouldComponentUpdate() passed!

2. Compares Virtual DOMs:

Old Virtual DOM	Re-rendered Virtual DOM
<div></div>	<div>...</div>

Faster than "real" DOM

3. Differences?
   Differences found => Update "real" DOM (not re-render) No Differences? => Don't touch the "real" DOM!