Functions

Question 1

What is a function in JavaScript?

Answer 1

Functions allow you to package up code for use later in your program. Block of code you can run over and over.

Question 2

Describe the parts of a function definition.

Answer 2

Function keyword, an optional name
zero or more parameters, a code block,
and an optional return statement

Question 3

Describe the parts of a function call.

Answer 3

name of the function followed by parentheses.

Question 4

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

Answer 4

Function call has arguments vs function definition have parameters.

Question 5

What is the difference between a parameter and an argument?

Answer 5

Parameters are like placeholders for variables whose value is not known. Arguments are the values that are passed through the parameters and calling the function.

Question 6

Why are function parameters useful?

Answer 6

Allows a function to perform tasks without knowing the specific input values ahead of time. Flexibility.

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.