August 2017
Beginner
298 pages
7h 4m
English
Content preview from JavaScript by Example
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Performance
DOM updates are costly. Repaints and reflows are synchronous events and therefore, they need to be minimized as much as possible. React deals with this scenario by maintaining a virtual DOM, which makes React applications really fast.
Whenever we make a modification to the JSX element in the render method, React will update the virtual DOM instead of the real DOM. Updating the virtual DOM is fast, efficient, and much less expensive than updating the real DOM and only the elements that are changed in the virtual DOM will be modified in the actual DOM. React does this by using a smart diffing algorithm, which we mostly won't have to worry about.
To understand how React works in detail and its performance, you can read the following ...
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