ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Working with arrays
AS3 override function concat(...args):Array
{
var passArgs:TypedArray = new TypedArray(dataType);
for (var i:* in args)
{
// type check done in push()
passArgs.push(args[i]);
}
return (super.concat.apply(this, passArgs));
}
The splice() method takes an arbitrary list of arguments, but the first two arguments always refer to an index
number and the number of elements to delete. This is why the overridden splice() method does type checking only
for args array elements in index positions 2 or higher. One point of interest in the code is that there appears to be a
recursive call to splice() inside the for loop, but this is not a recursive call because args is of type Array rather than
TypedArray, which means that the call to args.splice() is a call to the superclass version of the method. After the
for..in loop concludes, the args array contains only values of the correct type in index positions 2 or higher, and
splice() calls its own superclass version, as shown in the following code:
AS3 override function splice(...args):*
{
if (args.length > 2)
{
for (var i:int=2; i< args.length; i++)
{
if (!(args[i] is dataType))
{
args.splice(i,1);
}
}
}
return (super.splice.apply(this, args));
}
The unshift() method, which adds elements to the beginning of an array, also accepts an arbitrary list of arguments.
The overridden unshift() method uses an algorithm very similar to that used by the push() method, as shown in
the following example code:
}
AS3 override function unshift(...args):uint
{
for (var i:* in args)
{
if (!(args[i] is dataType))
{
args.splice(i,1);
}
}
return (super.unshift.apply(this, args));
}
Last updated 6/6/2012
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