Basic
A variable acts as a location to store
data.
Intermediate
Advanced
A Class is a defined data type, an aggregate
of named data elements and a set of operations
to manipulate that data.
A class can contain primitive data types
and referenced data types and a method by
which to manipulate the data in these data
types to create an new processed data type.
variables must be
declared before they can be used in a program.
Declaring a variable creates the location
in which to store data. That is a defined
area of memory that is responsible for
holding a piece of data.
var height;
Assigning A Value
Once the variable is declared
it can then be assigned a value. Initially
the variable only contains random data and
so must be given a specific data value as
defined by he user.
height = 10;
The variable has now been defined (storage
location created) and value assignmenta to
it (data put in the storage location). It
can now be called upon in a program so that
the data within it can be used when needed
by the program.
To use a custom class you need to define
a class head and class body and save the
class in an seperate actionscript file
.as
Each class must have its own .as file and
be stored in the same directory as the
main document files.
The class head assign Value To A
Variable
Local Variables
Global Variables
var
height; //declares
global variables
var width;
height = 10; //defines variable
values
width = 20;
// variables
are used to define the behavior
of a custom function
function ntriangleArea():
number{
var area = 0.5*height*width; //declares
local variable
return area;
}
// function
is called, result is returned
and then written to the output window
trace(ntriangleArea()); |
Note: Conventionally
class names begin with a capital
letter.
