The React rendering system and the virtual DOM
React is a popular JavaScript library that enables developers to create dynamic and scalable user interfaces. A key element of React is rendering, which is based on virtual DOMs. (Document Object Model) is based.
The virtual DOM is a lightweight representation of the real DOM, which is created internally by React. In contrast to the real DOM, the virtual DOM can be updated very quickly and works extremely efficiently. This allows user interfaces created with React to respond quickly and smoothly.
Incremental rendering, component memoization and the context
Incremental rendering is a decisive factor for the performance of React. Incremental rendering only updates the parts of the user interface that are actually affected when the state of a React application changes. In this way, the rendering system avoids unnecessary rendering and thus saves a lot of time and resources.
Another important function of React Rendering is the ability to memoize components. When a component is memoized, it is only re-rendered if its state has actually changed. Otherwise, React uses the already rendered version of the component. This also avoids unnecessary rendering and improves the performance of applications written in React.
Context is another important concept in React. It makes it possible to pass data between components in a React application without having to pass it via a long chain of higher-level components. This improves the maintainability and readability of the code and optimizes the performance of React applications.
Conclusion
React's rendering is a powerful tool for creating fast and responsive user interfaces. By using virtual DOMs, incremental rendering, component memoization and context, developers can create high-quality React apps that work quickly and effectively.
If you want to learn more about React rendering, we recommend reading the article "A Mostly Complete Guide to React Rendering Behavior" by Mark Erikson to view. There you will find detailed information on context and rendering behavior in React as well as many other useful tips and tricks.
Until the next Frontend Friday!
Sources
- A Mostly Complete Guide to React Rendering Behavior: https://blog.isquaredsoftware.com/2020/05/blogged-answers-a-mostly-complete-guide-to-react-rendering-behavior/#context-and-rendering-behavior
- Document Object Model: https://de.wikipedia.org/wiki/Document_Object_Model
