Introduction to JavaScript Basics

What does JavaScript primarily run in?

• Web browsers

• Desktop applications

• Mobile apps

• Server-side scripts

What symbol is used to denote a variable in JavaScript?

• Variable names in JavaScript are denoted by letters, underscores, or dollar signs.

• Asterisks and ampersands

• Numbers and special characters

• Only letters and numbers

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

• function myFunction[] { }

• myFunction() = function() { }

• function:myFunction() { }

• function myFunction() { }

What is the output of 'console.log(typeof 42)'?

• number

• string

• boolean

• undefined

How do you create an array in JavaScript?

• let arr = () => {};

• let arr = [];

• let arr = {};

• let arr = new Array();

What keyword is used to define a constant variable?

• final

• const

• static

• immutable

Which operator is used for equality comparison in JavaScript?

• =

• == and ===

• <=>

• !==

What is the purpose of the 'return' statement in a function?

• To create a loop within the function.

• The purpose of the 'return' statement is to provide a value from a function to its caller.

• To end the function execution immediately.

• To define the function's parameters.

How can you add a comment in JavaScript?

• Use // for single-line comments and /* comment */ for multi-line comments.

• Use // for multi-line comments and # comment for single-line comments.

• Use # for single-line comments and // for multi-line comments.

• Use /* comment */ for single-line comments and // comment for multi-line comments.

What does 'NaN' stand for in JavaScript?

• Not-a-Number

• Not-a-String

• Not-a-Value

• Not-a-Variable