React Questions

Question 1

Difference between state and props

Answer 1

Both used to pass data but state is mutable but managed within a component; props are immutable and can be passed between components

Question 2

How does react handle forms, what are controlled components?

Answer 2

React uses controlled components to handle form elements.

Input values controlled by the state of the component which enables react to control and validate user input

Question 3

Significance of keys in react lists

Answer 3

Used to identify unique elements in a react list. They help efficiently update UI by minimising re renders.

Keys should be stable and unique and assigned to elements inside a map function

Question 4

Purpose of use effect

Answer 4

Handle side effects in functional components allowing you to perform actions such as data fetching or subscriptions after the component renders