This tutorial is one of many of my tutorials for Flash MX - Actionscript. In
this tutorial you will learn how to declare and use variables with
actionscript.
Declaring variables in actionscript is very similar to most languages.
var number = 15;
var word = "text";
var answer = "true";
var num2 = "0.3423";
String : A string is a sequence of characters such as letters, numbers,
and punctuation marks. You enter strings in an ActionScript
statement by enclosing them in single or double quotation marks.
| code: |
var firstName = "Ron"; var lastName = "Zimmer"; |
You can use the addition (+) operator to concatenate, or
join, two strings.
| code: |
var fullName ; fullName = firstName + " " + lastName; |
Some characters can't be displayed as a literal part of a string
without being preceded by a backslash (\). This is called
"escaping" a character. There are other characters that can't be
displayed in ActionScript except by special escape sequences.
The following are some examples :
\b - Backspace character (ASCII 8)
\f - Form-feed character (ASCII 12)
\n - Line-feed character (ASCII 10)
\r - Carriage return character (ASCII 13)
\t - Tab character (ASCII 9)
\" - Double quotation mark
\' - Single quotation mark
\\ - Backslash
Boolean : A Boolean value is one that is either true or false. ActionScript
also converts the values true and false to 1 and 0 when
appropriate.
| code: |
var rUHuman = true; var rUABird = false; |
Numbers : A number value can be a negative or positive integer or real
number (decimal numbers). Simple mathematic functions such
as addition can be used as followed.
| code: |
var number = 2 + 6; |
Actionscript automatically refers to BEDMAS (Brackets,
Exponents, Division, Multiplication, Addition, Subtraction) if
your not careful placing your brackets then your answer could
be flawed. Example :
| code: |
var number = 6*7+4-2; |
Above your answer would be 44.
| code: |
var number = 6*(7+4-2); |
Above your answer would be 54.
Number values can be held in variables and worked thru them
example :
| code: |
var num1 = 7; var num2 = 8 var total = num1 + num2; |
Operators :
+ Addition
* Multiplication
/ Division
% Modulo (remainder of division)
- Subtraction
++ Increment
-- Decrement
In the following example, age is incremented first and then
tested against the number 30:
| code: |
if (++age >= 30) |
In the following example, age is incremented after the test
is performed:
| code: |
if (age++ >= 30) |
If a variable is given a name but no value the default value given to it is undefined.
That concludes the tutorial on variables if you are confused with anything don't be afraid to ask
