Virtual DOM’s main concept is to keep a virtual representation of UI in the memory and sync it with real DOM using the r

As I have mentioned earlier, Incremental DOM brings a solution to reduce the memory consumption in Virtual DOM by using real DOM to track changes. This approach has reduced the calculating overhead drastically and improved the memory usage of the applications as well.

React vs. Svelte: The War Between Virtual and Real DOM A quick look at the approaches taken by Svelte and React to build user interfaces and how they perform against each…blog.bitsrc.io

The main idea behind this Incremental DOM concept is to compile every component into a set of instructions. Then, these instructions are used to create the DOM tree and make changes to it.

This diffing process indeed reduces the workload on real DOM. And it needs to compare the current Virtual DOM state with the previous one to identify the changes. To understand this better, let’s take a small React code example:

Out of these two Document Object Models(DOMs), Virtual DOM has been the front runner for a long time. One can argue that saying “Virtual DOM is popular because of React,” and on the other hand, React has mainly been benefited from this Virtual DOM concept.

Unlike the Virtual DOM, Incremental DOM doesn’t generate a copy of real DOM when re-rendering the application UI. Besides, Incremental DOM won’t allocate any memory if there are no changes in the application UI. Most of the time, we re-render the applications without any significant modifications. So following this approach can drastically save the device’s memory.

Incremental DOM makes the most out of this since it uses an instructions based approach. As mentioned earlier, Incremental DOM compiles each component to a set of instructions before the compilation, and this helps to identify the unused instructions. So, they can be removed at the compilation time.

This optimization becomes very handy when it comes to devices with low memory capacity like mobile phones. Besides, optimization of memory usage is not an easy task. Also, the memory usage of an application purely depends on the bundle size and the memory footprint.

Assume that the name prop’s initial value was “Chameera,” and it was changed to “Reader” later. The only change in the whole code is the prop, and there is no need to change the DOM node or compare attributes inside the tag. However, with the diffing method, it is necessary to go through all the steps to identify the changes.

We can see an enormous amount of minor changes like that in a development process, and comparing each element in the UI is undoubtedly an overhead. This can be recognized as one of the main disadvantages of Virtual DOM.

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Both these DOMs have strengths of their own, and we can’t just say Virtual DOM is better, or Incremental DOM is better. However, what I can say for sure is that both Virtual DOM and Incremental DOM are excellent options to have, and they can handle dynamic DOM updates without any issue.

Although Incremental DOM brings a solution to reduce the memory usage, that solution impacts Incremental DOMs speed since difference calculation takes more time than the Virtual DOM approach. So, we can recognize this as the main disadvantage of using Incremental DOM.

Incremental DOM brings a more straightforward approach than Virtual DOM by using real DOM to locate code changes. So, there won’t be any virtual representation of the real DOM in memory to calculate the difference, and real DOM is used to diff against new trees.

React vs. Svelte: The War Between Virtual and Real DOM A quick look at the approaches taken by Svelte and React to build user interfaces and how they perform against each…blog.bitsrc.io