React & JS - Day 5 - KEC

const arr = [1,2,3]

const {a, b, c} = arr

console.log(a)

• 1

• undefined

• null

• Error

How can you destructure an object in JavaScript?

• const { name, age } = { person };

• const { name, age } = person;

• const { name: name, age: age } = person;

• const [name, age] = person;

Which React Hook is used to perform side effects in a functional component?

• useState

• useSideEffect

• useEffect

• useFetch

What array method is used to remove the first element from an array?

• pop()

• shift()

• slice()

• unshift()

const arr = [1,2,3]

const [a: x, b, c] = arr

console.log(x)

• 1

• undefined

• null

• Error

What array method is used to check if all elements in an array pass a certain condition?

• verifyAll()

• every()

• checkAll()

• all()

Which React Hook is used to create a state variable in a functional component?

• createState()

• useState()

• setState()

• setName()

What is the purpose of using the 'map' method on an array in JavaScript?

• To filter out elements from the array

• To transform each element of the array and return a new array

• To check if any element in the array satisfies a condition

• To add new elements to the beginning of the array

Which array method is used to merge two or more arrays in JavaScript?

• concat()

• merge()

• combine()

• join()

const a = {}
const b = {}
console.log(a == b)

• True

• False

• Both True and False

• Cannot say