The following are some of the most frequently asked react interview questions.ĥ. When the state of an object changes, the virtual DOM changes only that object in the real DOM, rather than updating all the objects. React keeps a lightweight representation of the real DOM in the memory, and that is known as the virtual DOM. Each branch of the tree ends in a node, and each node contains objects. The DOM represents an HTML document with a logical tree structure. For this, we use BabelĭOM stands for Document Object Model.
For a web browser to read a JSX file, the file needs to be transformed into a regular JavaScript object. This is because they are built to only read regular JS objects and JSX is not a regular JavaScript object Web browsers cannot read JSX directly. By using JSX, we can write HTML structures in the same file that contains JavaScript code. It is used with React to describe what the user interface should look like. This results in much faster web applications. High performance: React updates only those components that have changed, rather than updating all the components at once. A unidirectional data flow means that when designing a React app, you often nest child components within parent components. One-way data-binding: React’s one-way data binding keeps everything modular and fast. When the state of an object changes, virtual DOM changes only that object in the real DOM, rather than updating all the objects. Virtual DOM: React keeps a lightweight representation of the real DOM in the memory, and that is known as the virtual DOM. It splits the user interface into independent, reusable parts that can be processed separately. By using JSX, we can write HTML structures in the same file that contains JavaScript code.Ĭomponents: Components are the building blocks of any React application, and a single app usually consists of multiple components. JSX: JSX is a syntax extension to JavaScript. 
Here are some React Interview Questions on basic concepts. Enroll now! Basic Level - ReactJS Interview Questions
Consider the React.JS Certification Training Course. Master the fundamentals of React including JSX, props, state, and events. Here's a comprehensive list of all the common ReactJS interview questions from basic to advanced levels that are frequently asked in interviews. As of now, React is the most popular front-end technology that more and more companies are using, and if you are preparing for a job interview, this is ReactJS interview questions tutorial is just the right one for you. React is quite the buzzword in the industry these days.
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