'The React Virtual DOM Explained' react dom
Let’s first understand what DOM is? DOM stands for Document Object Model. It is a structural representation of a tree with nodes representing different HTML tags as JavaScript objects which makes it easier for the browser to understand.
According to the process, after every state change, the DOM tree has to be re-rendered, and re-rendering a tree with 1000 nodes is not a good way to deal with it as many things can go wrong like losing speed or accuracy and can even cost us as it may take a lot of space while doing so.Virtual DOMVirtual DOM or VDOM is just a virtual representation of the UI which is kept in the memory and synced with Real DOM”.
But the real question is how it is faster when all the properties and even the process of rendering the UI after modification is the same?We all know that in virtual DOM, a virtual object similar to the actual object is created with similar properties and also that after every state change, the DOM will re-render itself, but React has something different in store for us.
Simply said, Real DOM will only be rendered for those parts where changes have taken place, and there will be no re-rendering for the rest of the Tree. This will affect the speed and efficiency of our apps and pages.The following image represents the Tree structure of the DOM with its nodes. The blue circles represent the original state of the DOM while the red ones represent the updated state
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