JavaScript Variables Quiz

Which keyword is used to declare a variable in JavaScript?

• var

• let

• const

• all of the above

What is the correct way to assign a value to a variable in JavaScript?

• x = 5;

• 5 = x;

• x == 5;

• x := 5;

Which of the following is a valid variable name in JavaScript?

• myVariable

• 123Variable

• $variable

• var

What is the scope of a variable declared with the 'var' keyword?

• Global scope

• Local scope

• Block scope

• Function scope

What is the scope of a variable declared with the 'let' keyword?

• Global scope

• Local scope

• Block scope

• Function scope

What is the scope of a variable declared with the 'const' keyword?

• Global scope

• Local scope

• Block scope

• Function scope

Which of the following is a valid variable naming convention in JavaScript?

• camelCase

• snake_case

• PascalCase

• all of the above

What is the initial value of an uninitialized variable in JavaScript?

• null

• undefined

• 0

• NaN

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

• my-variable

• my variable

• myVariable

• myVariable123

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

• var x = 5;

• let x = 5;

• const x = 5;

• x = 5;