Basics

Question 1

What is React ?

Answer 1

It is JavaScript Library to create websites, allows us to create single page apps

Question 2

Create react app

Answer 2

npx create-react-app websitename

Question 3

What is react hooks

Answer 3

React hooks are the built-in functions that permit the use state and life cycle methods in react components.

Question 4

.map() array method does what?

Answer 4

.map() modifies existing array and returns new array

Question 5

What are props

Answer 5

Props are passed to components just as arguments to functions

Question 6

Render() in react

Answer 6

Every component in react has to return HTML. Render() is used for this

Question 7

What is store

Answer 7

Store is single source of truth and it includes the entire application state

Question 8

Declare constant in react

Answer 8

Export const var_name = “value”

Question 9

JSON.stringify(obj)

Answer 9

Converts from a JavaScript value to a JSON string

Question 10

Hook rules

Answer 10

1.Cannot be conditional
2. Can only be called at the top level of component
3.Can only be called inside react function components.

Question 11

Higher-order components

Answer 11

1.Acts as a container for other components.
2.Keeps components simple and reusable.
3.Acts as a decorator for components and adds functionality