1. Javascript Functions

2. Function Header Line function name arguments
Myfunction ( )
function name
arguments
Myfunction( ) is called by using
Myfunction() on a line
* * * * *

3. body { Parts of all Functions Function: header fnname( ) { }
{ }
body {
note alignment
* * *

4. Basics of Functions
Shorthand way of accomplishing a single, cohesive task.
May be used any number of times.
Functions can call other functions.
Functions remember where they were called from and return to the next statement upon completion.

5. Example Function function sayHello(name) { alert (“Hello” + name); }
sayHello (“Charles”);
* *

6. Functions
Passing Parameters
Arguments

7. Style for Functions
Each function should be preceded by a block comment that includes:
author name & date
description of the module
list of external modules used by this one
any citations or other notes
Use “whitespace” before and after.
Readability counts! *

8. Style Provides Readability
Programmer Friendly
consistent spacing
predictable placement
mnemonic identifiers
Typical “large” program
in school, 3-5K lines
“real-world” projects
over 100K lines
many are over 1M