JavaScript Quiz

Which type of JavaScript language is ___

• 1. Object-Oriented

• 1. Object-Based

• 1. Assembly-language

• 1. High-level

What is the purpose of the 'this' keyword in JavaScript?

• 1. To refer to the current object

• 1. To declare a variable

• 1. To create a loop

• 1. To import external libraries

What does the 'typeof' operator in JavaScript return?

• 1. The data type of a variable

• 1. The value of a variable

• 1. The length of a string

• 1. The index of an array element

What is the correct way to comment a single line in JavaScript?

• 1. // This is a comment

• 1. /* This is a comment */

• 1. # This is a comment

• 1. %% This is a comment

What is the purpose of the 'let' keyword in JavaScript?

• 1. To declare a block-scoped variable

• 1. To refer to the current object

• 1. To create a loop

• 1. To import external libraries

What does the 'NaN' value represent in JavaScript?

• 1. Not a Number

• 1. Null

• 1. Undefined

• 1. Infinity

Which method is used to add a new element to the end of an array in JavaScript?

• 1. push()

• 1. pop()

• 1. shift()

• 1. unshift()

What is the purpose of the 'forEach' method in JavaScript?

• 1. To iterate over the elements of an array

• 1. To add a new element to the end of an array

• 1. To remove the first element of an array

• 1. To check if an element exists in an array

What is the correct way to declare a constant variable in JavaScript?

• 1. const myVar = 10;

• 1. let myVar = 10;

• 1. var myVar = 10;

• 1. constant myVar = 10;

What does the '=== ' operator in JavaScript compare?

• 1. Value and type

• 1. Value only

• 1. Type only

• 1. Reference in memory