Components are the building blocks of React applications. They are reusable pieces of code that can be combined to create complex user interfaces. Components can be either functional or class-based.
State is an object that holds the data that determines a component's behavior and rendered output. It can be changed by the component and its children, but it is not accessible from outside the component.
Props and state are both used to pass data between components in React. The main difference is that props are passed down from the parent component, whereas state is managed within the component itself.
The setState() method is used to update a component's state. When setState() is called, React will re-render the component with the updated state.
Lifecycle methods are methods that are called at specific points in a component's lifecycle. They allow developers to execute code at specific times, such as when a component is mounted or updated.
Controlled components are components that have their state controlled by React. Uncontrolled components are components that manage their state internally.
The virtual DOM is a concept in React that allows for efficient updating of the UI. React creates a virtual representation of the DOM and compares it to the actual DOM to determine what needs to be updated.
Higher-order components (HOCs) are components that take in another component and return a new component. HOCs are used to add functionality to existing components without modifying the original component.
In conclusion, React is a powerful library used for building user interfaces. Understanding its fundamentals is essential for success in a React interview. By studying these common React interview questions and their answers, you'll be better prepared to demonstrate your knowledge and skills to potential employers.
In the future, we can expect to see continued growth and development in the React ecosystem, with new features and functionality being added to the library. Staying up-to-date with the latest trends and best practices in React development will be critical for continued success in this field.
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