JavaScript Quiz

What is the keyword used to declare a variable in JavaScript?

• int

• string

• var

• let

How do you declare a constant variable in JavaScript?

• const

• var

• constant

• let

What are the rules for naming variables in JavaScript?

• Variables must start with a number

• There are no rules for naming variables in JavaScript

• Variables can contain special characters like @, #, and %

• Variables can only contain letters, digits, underscores, or dollar signs, and must begin with a letter, underscore, or dollar sign.

Explain the difference between let, var, and const in JavaScript.

• var is block-scoped with immutable value, let is function-scoped, and const is block-scoped with mutable value.

• var is block-scoped, let is function-scoped, and const is block-scoped with mutable value.

• var is function-scoped, let is block-scoped, and const is block-scoped with immutable value.

• var is block-scoped, let is block-scoped, and const is function-scoped.

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

• Block scope

• Global scope

• Class scope

• Function scope

What keyword is used to define a function in JavaScript?

• loop

• var

• function

• define

What is the difference between function declaration and function expression in JavaScript?

• Function declaration and function expression both require the 'function' keyword to define a function in JavaScript.

• Function declaration is hoisted and can be called before it is defined, while function expression is not hoisted and cannot be called before it is defined.

• Function declaration is not hoisted and cannot be called before it is defined, while function expression is hoisted and can be called before it is defined.

• Function declaration and function expression are the same thing in JavaScript.

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

• To specify the value that a function should return

• To declare a new variable

• To end the function execution

• To print a message to the console

How do you pass arguments to a function in JavaScript?

• By including them after the 'return' keyword

• By separating them with a semicolon

• By declaring them outside of the function

• By including them within the parentheses when calling the function.