Q11. What is state in React?
_State_ of a component is an object that holds some information that may change over the lifetime of the component. The important point is whenever the state object chang...
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Q12. What is the difference between state and props?
In React, both **state** and **props** are plain JavaScript objects, but they serve different purposes and have distinct behaviors: ### State - **Definition:** State is a...
Q13. What are inline conditional expressions?
You can use either _if statements_ or _ternary expressions_ which are available in JS(and JSX in React) to conditionally execute or render expressions. Apart from these a...
Q14. 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....
Q15. 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...
Q16. 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...
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 do you conditionally render components?
In some cases you want to render different components depending on some state. JSX does not render `false` or `undefined`, so you can use conditional _short-circuiting_ t...
Q20. How to re-render the view when the browser is resized?
You can use the `useState` hook to manage the width and height state variables, and the `useEffect` hook to add and remove the `resize` event listener. The `[]` dependenc...