JavaScript Quiz

What type of language is JavaScript?

• JavaScript is a high-level, interpreted programming language.

• JavaScript is a low-level, compiled programming language.

• JavaScript is a markup language.

• JavaScript is a database management system.

Which of the following is not a valid JavaScript variable name?

• 1stVariable

• first_name

• firstName

• _firstName

Which of the following is the correct way to declare a function in JavaScript?

• function functionName(parameters) { // function body }

• def functionName(parameters): // function body

• functionName(parameters) { // function body }

• function functionName(parameters); // function body

What is the purpose of the typeof operator in JavaScript?

• The typeof operator checks the data type of a value or variable.

• The typeof operator converts a value to a string.

• The typeof operator checks if a value is null.

• The typeof operator checks if a value is undefined.

How would you check if a variable x is equal to 5 in JavaScript?

• x === 5

• x = 5

• x == 5

• x != 5

Which of the following is a correct statement about JavaScript?

• JavaScript is used only for front-end development.

• JavaScript is used for both front-end and back-end development.

• JavaScript cannot be used for mobile app development.

• JavaScript is a compiled language.

What is the purpose of the "else" statement in JavaScript?

• To specify an alternative block of code to be executed if the condition in the if statement is false.

• To specify a block of code to be executed if the condition in the if statement is true.

• To terminate the execution of a function.

• To declare a variable.

What does the method toLowerCase() do in JavaScript?

• Converts a string to lowercase.

• Converts a string to uppercase.

• Converts a number to a string.

• Converts a string to a number.

In JavaScript, what is the starting index of an array?

• 0

• 1

• 2

• 3

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

• let myVariable;

• var myVariable;

• const myVariable;

• All of the above