Chapter 2: Actionscript Language Reference; (Decrement) - MACROMEDIA FLASH MX 2004-ACTIONSCRIPT LANGUAGE Reference

–– (decrement)
Availability
Flash Player 4.
Usage
––expression
expression––
Parameters
A number or a variable that evaluates to a number.
expression
Returns
A number.
Description
Operator (arithmetic); a pre-decrement and post-decrement unary operator that subtracts 1 from
the
expression
The pre-decrement form of the operator (
returns the result. The post-decrement form of the operator (
and returns the initial value of
expression
more information, see "Operator precedence and associativity" in Using ActionScript in Flash.
Example
The pre-decrement form of the operator decrements
var x:Number = 3;
var y:Number = --x;
//y is equal to 2
The post-decrement form of the operator decrements
value of as the result
x
var x:Number = 3;
var y:Number = x--;
//y is equal to 3
ActionScript Language Reference
. The can be a variable, element in an array, or property of an object.
expression
:
y
) subtracts 1 from
––expression
expression––
(the value prior to the subtraction). For
expression
to 2 ( -
x x
to 2 (
x x
CHAPTER 2
expression
) subtracts 1 from the
) and returns the result as
1 = 2
- ) and returns the original
1 = 2
and
:
y
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