React: The Virtual DOM | Codecademy

Learn how React's virtual DOM prevents wasteful DOM manipulation. The Problem DOM manipulation is the heart of the modern, interactive web. Unfortunately, it is also a lot slower than most JavaScript operations. This slowness is made worse by the fact that most JavaScript frameworks update the DOM much more than they have to. As an example, let’s say that you have a list that contains ten items. Y

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“Manipulating the DOM is slow. Manipulating the virtual DOM is much faster, because nothing gets drawn onscreen”