Q11. What is the difference between Shadow DOM and Virtual DOM?
The _Shadow DOM_ is a browser technology designed primarily for scoping variables and CSS in _web components_. The _Virtual DOM_ is a concept implemented by libraries in ...
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Q12. What are controlled components?
A **controlled component** is a React component that **fully manages the form element's state**(e.g, elements like ``, ``, or ``)) using React's internal state mechanism....
Q13. What are uncontrolled components?
The **Uncontrolled components** are form elements (like ``, ``, or ``) that **manage their own state internally** via the **DOM**, rather than through React state. You ca...
Q14. What is Lifting State Up in React?
When several components need to share the same changing data then it is recommended to _lift the shared state up_ to their closest common ancestor. That means if two chil...
Q15. What are Higher-Order Components?
A _higher-order component_ (_HOC_) is a function that takes a component and returns a new enhanced component with additional props, behavior, or data. It’s a design patte...
Q16. Does the lazy function support named exports?
No, currently `React.lazy` function supports default exports only. If you would like to import modules which are named exports, you can create an intermediate module that...
Q17. What are stateless components?
If the behaviour of a component is independent of its state then it can be a stateless component. You can use either a function or a class for creating stateless componen...
Q18. What are stateful components?
If the behaviour of a component is dependent on the _state_ of the component then it can be termed as stateful component. These _stateful components_ are either function ...
Q19. How to apply validation on props in React?
When the application is running in _development mode_, React will automatically check all props that we set on components to make sure they have _correct type_. If the ty...
Q20. What are components and give an example?
Components are reusable Vue instances with a name. They accept the same options as new Vue, such as data, computed, watch, methods, and lifecycle hooks(except few root-sp...