JavaScript Variables Quiz

What is the syntax for declaring a variable in JavaScript?

• variableName = variableType

• var/let/const variableName

• variableName = var/let/const

• variableName = value

How do you assign a value to a variable in JavaScript?

• x = true

• x = 10

• x = 5

• x = 'five'

Which of the following is a valid variable name in JavaScript? a) myVariable b) 123Variable c) $variable d) variable-name

• d) variable-name

• c) $variable

• b) 123Variable

• a) myVariable

What is the purpose of declaring a variable in JavaScript?

• To import external libraries

• To create a function

• To display data on the webpage

• To store and manipulate data

Which keyword is used to declare a variable in JavaScript?

• const

• var

• let

• function

What happens if you declare a variable without assigning a value to it?

• The variable will have an initial value of undefined.

• The variable will have an initial value of false.

• The variable will have an initial value of 0.

• The variable will have an initial value of null.

Which of the following is not a valid variable naming convention in JavaScript? a) camelCase b) snake_case c) PascalCase d) kebab-case

• a) camelCase

• b) snake_case

• d) kebab-case

• c) PascalCase

What is the scope of a variable declared using the 'var' keyword in JavaScript?

• Block scope

• Function scope

• Global scope

• Object scope

What is the scope of a variable declared using the 'let' keyword in JavaScript?

• function

• block

• global

• object

What is the scope of a variable declared using the 'const' keyword in JavaScript?

• global scope

• block scope

• object scope

• function scope