Javascript Functions

Question 1

What is a function in javascript ?

Answer 1

Code that performs a task and can be reused later in a program

Question 2

Describe the parts of a function definition.

Answer 2

-Function Keyword
-Optional name
-Comma separated list of 0 or more parameters surrounded by parenthesis
-Start of function code block followed by opening curly brace
-Optional return statement and end of code block closing curly brace

Question 3

Describe the parts of a function call.

Answer 3

-Function name-Comma separated list surrounded by parenthesis

Question 4

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

Answer 4

Function calls are running the function where as function definition is simply defining what the function should do

Question 5

What is the difference between a a parameter and an argument ?

Answer 5

Parameter is a placeholder, argument is a value

Question 6

Why are function parameters useful ?

Answer 6

They allow functions to be customizable

Question 7

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

Answer 7

Produces a value that can be used in a program and prevents any code from being executed after the return statement