Virtual DOM is an abstraction of the DOM. Think of it as a lightweight representation of the real thing. For example, you can draw a room on paper, but it won’t change the actual space. The same thing happens with the DOM in a web application. The DOM comprises different nodes, each representing an element in the application.
The DOM is an object that a browser uses to display web content. A browser parses a page and extracts child elements from specific elements. These child elements are then removed from the DOM. The browser then recalculates CSS for all of the parent nodes. Finally, it traverses the tree to display what’s on the screen. This process is similar to updating a house’s blueprint.
There are many different types of React components. For example, a part can be read-only or have a state and can be built in the constructor. To create a member, you first create a new component class and then add a constructor. When you’re done, you can render the component.
The constructor() function initiates a component and then sets the component’s state and props. These are stored in an object called a state. The constructor should honor inheritance from its parent component. If you have more than one component, use the super() statement to execute the parent component’s constructor function.
The W3Schools course includes a quiz with 25 and 40 questions. Each question is scored, and you’ll get an overall score. In addition, you can review the questions to ensure you’re getting the correct answer.