javascript-functions

Question 1

What is a function in JavaScript?

Answer 1

Functions allow you to package up code for use later in your program; collection of code we can call any time we like and pass in values

Question 2

Describe the parts of a function definition.

Answer 2

1. Function keyword
2. Optional name
3. Comma separated list of zero or more arguments surrounded by parentheses
4. Code block
5. Optional return statement

Question 3

Describe the parts of a function call.

Answer 3

1. Function name

2. Comma separated list of zero or more arguments surrounded by parentheses

Question 4

When comparing them side-by-side, what are the differences between a function call and a function definition?

Answer 4

Definition has the function keyword and code block (as seen by the curly braces)

Question 5

What is the difference between a parameter and an argument?

Answer 5

When we define a function, we declare parameters (like a placeholder) and when we call a function, we pass it arguments (actual values)

Question 6

Why are function parameters useful?

Answer 6

They work as placeholders for values that are not known until it can later be used to pass in any value into a function

Question 7

What two effects does a return statement have on the behavior of a function?

Answer 7

1. Causes the function to produce a value we can use in our program. 2. Prevents any more code in the function’s code block from being run.