React & JS

useState() is called as _

• React Hook

• React Object

• React Array

• None of the above

const [count, setCount] = useState(20)

What is the value of count?

• 0

• 20

• 2

• undefined

const [count, setCount] = useState()

What is the value of count?

• 0

• 20

• undefined

• None of the above

The function passed as an argument to higher order function is called

• Callback function

• React hooks

• Asynchronous function

• None of the above

Triple dot operator (...) is called as

• Spread operator

• Rest operator

• Both Spread and Rest operator

• No such operator exist

Promise in JS can be handled using

• .then().catch()

• Arrays

• Objects

• Functions

React hooks are basically

• Functions

• Objects

• Arrays

• None of the above

Which is not an array method in JS

• push

• pop

• split

• None of the above

Which array method is used to convert array to a string

• join()

• split()

• slice()

• None of the above

<></> will appear in DOM

• False

• True

• Neither False nor True

• Cannot say