| Package | Top Level |
| Class | public class arguments |
| Inheritance | arguments  Object |
| Language Version: | ActionScript 3.0 |
| Runtime Versions: | AIR 1.0, Flash Player 9, Flash Lite 4 |
The arguments are stored as array elements: the first is accessed as
arguments[0], the second as arguments[1], and so on. The
arguments.length property indicates the number of arguments passed to
the function. There may be a different number of arguments passed than
the function declares.
Unlike previous versions of ActionScript, ActionScript 3.0 has no arguments.caller property.
To get a reference to the function
that called the current function, you must pass a reference to that function as an
argument. An example of this technique can be found in the example for arguments.callee.
ActionScript 3.0 includes a new ...(rest) keyword that is recommended instead of the
arguments class.
Related API Elements
Hide Inherited Public Properties
Show Inherited Public Properties| Property | Defined By | ||
|---|---|---|---|
| callee : Function
A reference to the currently executing function. | arguments | ||
 | constructor : Object
A reference to the class object or constructor function for a given object instance. | Object | |
| length : Number
The number of arguments passed to the function. | arguments | ||
callee | property |
public var callee:Function| Language Version: | ActionScript 3.0 |
| Runtime Versions: | AIR 1.0, Flash Player 9, Flash Lite 4 |
A reference to the currently executing function.
Example ( How to use this example )
secondFunction(). The firstFunction() function has
the Boolean argument of true
to demonstrate that secondFunction() successfully calls firstFunction() and
to prevent an infinite loop of each function calling the other.
Because the callSecond parameter is true, firstFunction()
calls secondFunction() and passes a reference to itself as the only
argument. The function secondFunction() receives this argument and stores it
using a parameter named caller, which is of data type Function. From within secondFunction(), the
caller parameter is then used to call the firstFunction function,
but this time with the callSecond argument set to false.
When execution returns to firstFunction(), the trace()
statement is executed because callSecond is false.
package {
import flash.display.Sprite;
public class ArgumentsExample extends Sprite {
private var count:int = 1;
public function ArgumentsExample() {
firstFunction(true);
}
public function firstFunction(callSecond:Boolean) {
trace(count + ": firstFunction");
if(callSecond) {
secondFunction(arguments.callee);
}
else {
trace("CALLS STOPPED");
}
}
public function secondFunction(caller:Function) {
trace(count + ": secondFunction\n");
count++;
caller(false);
}
}
}
length | property |
public var length:Number| Language Version: | ActionScript 3.0 |
| Runtime Versions: | AIR 1.0, Flash Player 9, Flash Lite 4 |
The number of arguments passed to the function. This may be more or less than the function declares.
arguments properties,
such as callee and length.
package {
import flash.display.Sprite;
public class ArgumentsExample extends Sprite {
public function ArgumentsExample() {
println("Hello World");
}
public function println(str:String):void {
trace(arguments.callee == this.println); // true
trace(arguments.length); // 1
trace(arguments[0]); // Hello World
trace(str); // Hello World
}
}
}
Wed Nov 21 2018, 06:34 AM -08:00