MACROMEDIA FLASH 8-FLASH LITE 2.X ACTIONSCRIPT LANGUAGE - Page 368

368 ActionScript classes
Example
The following function invocations are equivalent:
Math.atan2(1, 0)
Math.atan2.apply(null, [1, 0])
The following simple example shows how apply() passes an array of parameters:
function theFunction() {
trace(arguments);
}
// create a new array to pass as a parameter to apply()
var firstArray:Array = new Array(1,2,3);
theFunction.apply(null,firstArray);
// outputs: 1,2,3
// create a second array to pass as a parameter to apply()
var secondArray:Array = new Array("a", "b", "c");
theFunction.apply(null,secondArray);
// outputs a,b,c
The following example shows how apply() passes an array of parameters and specifies the
value of this:
// define a function
function theFunction() {
trace("this == myObj? " + (this == myObj));
trace("arguments: " + arguments);
}
// instantiate an object
var myObj:Object = new Object();
// create arrays to pass as a parameter to apply()
var firstArray:Array = new Array(1,2,3);
var secondArray:Array = new Array("a", "b", "c");
// use apply() to set the value of this to be myObj and send firstArray
theFunction.apply(myObj,firstArray);
// output:
// this == myObj? true
// arguments: 1,2,3
// use apply() to set the value of this to be myObj and send secondArray
theFunction.apply(myObj,secondArray);
// output:
// this == myObj? true
// arguments: a,b,c