That object is the virtual DOM. The Virtual DOM was one of React’s main differentiators when it first appeared. That’s ten times more work than necessary! Vue.js). For web developers, this text is an HTML code, and the DOM is simply called HTML DOM. It contains methods like getElementById or removeChild. 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. https://www.accelebrate.com/blog/the-real-benefits-of-the-virtual-dom-in-react-js It was a big advantage in comparison with previous frameworks, and newer libraries started to follow the same approach (e.g. Most JavaScript frameworks would rebuild the entire list. Elements of HTML become nodes in the DOM.So, while HTML is a text, the DOM is an in-memory representation of this text. Frameworks such as React and Vue use the virtual DOM concept to make more performant updates to the DOM. Manual DOM manipulation is messy and keeping track of the previous DOM state is hard. Of course, if you actually recreated the entire DOM every time your application state changed, your app would be very slow and your input fields would lose focus.

DOM manipulation is the heart of the modern, interactive web. virtual-dom is a collection of modules designed to provide a declarative way … The virtual DOM and frameworks. You check off the first item. A solution to this problem is to write your code as if you were recreating the entire DOM whenever state changes.

The framework's job is to reconcile the new one against the old one, to figure out what changes are necessary and apply them to the real DOM… The HTML DOM provides an interface (API) to traverse and modify the nodes. Just to get things straight - DOM stands for Document Object Model and is an abstraction of a structured text. It's more common to work with the virtual DOM via a framework, rather than interfacing with it directly as I showed in the example above. When you start learning React, the first concept to understand is Virtual DOM. Ok, now that we can turn our virtual DOM into a real DOM, it’s time to think about diffing our virtual trees. But before we jump into Virtual DOM, let’s see what is DOM itself. Every time your app's state updates (for example when the name prop changes), you create a new one.

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