JavaScript Functions

Question 1

What is the purpose of a function?

(Define)

Answer 1

A set of statements that performs a task or calculates a value. To use a function, you must define it somewhere in the scope from which you wish to call it.

Question 2

A function definition (also called a function declaration, or function statement) consists of the function keyword, followed by:

Answer 2

1. The name of the function.
2. A list of parameters to the function, enclosed in parentheses and separated by commas.
3. The JavaScript statements that define the function, enclosed in curly brackets, { }.

Question 3

Give example of function syntax.

Answer 3

For example, the following code defines a simple function named square:

function square(number) { return number * number; }

Question 4

What is a return keyword do?

Answer 4

1. It captures the value and returns it.
2. It also ends the function.

Question 5

Declaration vs Expression

Answer 5

• Declariation
  
  • Normal Syntax
• Expression
  
  • Becomes a function from result of expression (blahblah var = function ()

Question 6

When functions run… what do they return?

Answer 6

Whatever is defined in return

If no return keyword is present it is undefined

Question 7

Names of:

1. ” “
2. ( )
3. { }
4. []
5. | |
6. //
7. \

Answer 7

1. Quotes
2. Parenthesis
3. Braces
4. Brackets
5. Vertical Bar
6. Forward Slashes (Comment - JS)
7. Back slash - Show following charachter