JavaScript Function

What is a JavaScript function?

• A type of variable

• A set of instructions that performs a specific task

• A data structure used to store multiple values

• An operator that performs arithmetic operations

What is the keyword used to define a function in JavaScript?

• const

• define

• def

• function

What is a function parameter?

• The value returned by the function

• The name of the function

• An input passed to the function when it is called

• A variable used to store the function's output

What is the syntax for calling a function in JavaScript?

• functionName(argument1, argument2)

• function(argument1, argument2) = functionName

• functionName {argument1, argument2}

• functionName.argument1(argument2)

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

• To define the function

• To call the function

• To specify the value to be returned by the function

• To declare a new variable inside the function

How can you pass multiple parameters to a function in JavaScript?

• Separate them with a space

• Separate them with a period

• Separate them with a comma

• Separate them with a semicolon

What is the difference between a function declaration and a function expression?

• There is no difference

• A function declaration can be called before it is defined

• A function expression can be called before it is defined

• A function expression is defined using the "this" keyword

Answer explanation

The main difference between the two is that a function declaration is hoisted to the top of the current scope, which means that it can be called before it is defined in the code. On the other hand, a function expression is not hoisted and cannot be called before it is defined.

When I say that a function declaration is "hoisted to the top of the current scope", I mean that the function is moved to the top of its containing scope (i.e., the current function or global scope) during the compilation phase before the code is executed. This means that the function can be called before it is declared in the code.

Can a function in JavaScript have no parameters?

• Yes

• No