JavaScript

Which of the following is not a primitive data type in JavaScript?

• number

• string

• boolean

• array

Which operator is used to compare two values and return true if they are not equal in value and data type?

• !=

• ==

• !==

• ===

What is the result of the expression true && false in JavaScript?

• true

• false

• undefined

• null

What is the output of the following code? console.log(2 + "2");

• "4"

• 4

• "22"

• 22

Which keyword is used to declare a variable that cannot be reassigned in JavaScript?

• const

• let

• var

• none of all the answers

What is the result of the expression "5" - 2 in JavaScript?

• 3

• "3"

• NaN

• undefined

Which method is used to remove the last element from an array in JavaScript?

• pop()

• push()

• shift()

• unshift()

Which method is used to remove an element from an array at a specific index in JavaScript?

• slice()

• splice()

• remove()

• cut()

Which method is used to add an element to the beginning of an array in JavaScript?

• push()

• pop()

• unshift()

• shift()

What is the output of the following code? console.log(typeof []);

• array

• object

• undefined

• NaN