Understanding JavaScript Functions and Parameters

What is the correct syntax for declaring a function named `myFunction` in JavaScript?

• `function myFunction() {}`

• `declare myFunction() {}`

• `def myFunction() {}`

• `create myFunction() {}`

Which of the following is a function expression in JavaScript?

• `function myFunc() {}`

• `var myFunc = function() {}`

• `function: myFunc() {}`

• `myFunc function() {}`

What is the term for the values passed to a function when it is called?

• Parameters

• Arguments

• Variables

• Constants

In the following function, what is the parameter? ```javascript function greet(name) { return "Hello, " + name; } ```

• greet

• name

• "Hello, "

• return

What will the following function return? ```javascript function add(a, b) { return a + b; } ```

• The sum of `a` and `b`

• The product of `a` and `b`

• `a` minus `b`

• `b` minus `a`

Consider the following code:

```javascript

var x = 10;

function example() {

var x = 20;

println(x); }

example(); ```

What will be printed to the screen?

• 10

• 20

• 30

• undefined

How can you ensure a function returns a value in JavaScript?

• By using the `return` keyword followed by the value

• By using the `output` keyword followed by the value

• By using the `send` keyword followed by the value

• By using the `give` keyword followed by the value

What will the following code output and why?

```javascript

function calculateArea(length, width) {

if (width === undefined)

{ return length * length; }

return length * width; }

println(calculateArea(5)); ```

• 25, because only one argument is passed, so it calculates the area of a square

• 0, because width is undefined

• NaN, because width is not a number

• Error, because width is not provided

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

• To stop the execution of the function and return a value

• To declare a variable

• To call another function

• To log a message to the console

Given the following code, what will be the output and why?

```javascript

println(square(4));

var square = function(n) {

return n * n; }; ```

• 16, because the function is called with 4

• Error, because `square` is not a function

• undefined, because `square` is not defined

• NaN, because `n` is not a number