JavaScript Basics: Introduction to Arrays

What will be the output of the following JavaScript code: console.log(5 + '5')?

• '55'

• '5.5'

• '10'

• '25'

Which keyword is used to declare a variable in JavaScript?

• int

• let

• const

• var

What is the correct syntax for a single-line comment in JavaScript?

• /* This is a single-line comment */

• // This is a single-line comment

• /* This is a comment */

What is the purpose of using let keyword in JavaScript?

• To declare global variables

• To declare block-scoped variables

• To define functions

• To import external libraries

When should you use const keyword instead of let in JavaScript?

• When you want to declare a variable that will be reassigned frequently.

• When you want to confuse other developers.

• When you want to declare a variable that will not be reassigned.

• When you want to make your code less readable.

What is the result of 10 % 3 in JavaScript?

• 1

• 5

• 2

• 0

How do you access a property of an object in JavaScript?

• objectName[propertyName]

• objectName->propertyName

• objectName.propertyName()

• objectName.propertyName or objectName['propertyName']

What is the assignment operator in JavaScript?

• /

• *

• +

• -

• =

What is the value of x after the following JavaScript code: let x = 5; x += 3;?

• 8

• 2

• 10

• 7

Which data type can be stored in a JavaScript variable?

• Colors and shapes

• Dates and times

• Various data types such as strings, numbers, booleans, arrays, objects, and functions

• Only strings and numbers