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By using objects as keys, you can easily associate them with other data. I like to think of this like attaching sticky notes to something. Your Dictionary is a stack of sticky notes. When you attach a sticky note to your stapler, you don t actually modify the stapler, but you can always nd that information if you have access to the original object the stapler. If you want to ensure that the objects you use as keys aren t kept around unnecessarily by a Dictionary object, you can pass true as the weakKeys parameter in the Dictionary constructor:

x = 1.

new Dictionary(true);

The cell you clicked becomes the active cell. It appears highlighted, with a thicker border than the other cells.

The value defaults to false. For more information, see the discussion on weak references in relation to event handling in 20, Events and the Event Flow.

Dictionarys follow the same syntax for all the operations (inserting, deleting, setting, and retrieving) as an Object, so the techniques you learn in this chapter for using Objects also work with Dictionary instances.

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You can test for the existence of a key in an associative array either by performing a lookup or using the in operator. The in operator allows you to check on the existence of properties, methods, or values of an instance, as long as they are accessible. The operator returns a Boolean value. You can use the in operator to see if a key is associated with any value in an associative array:

var notes:Object = {Roger: "hereiam"}; "Roger" in notes; // Returns true "Bailey" in notes; // Returns false

(A.9)

You can use this operator to investigate instances of classes for methods and public properties, which they support, as well, as shown in Example 10-3.

EXAMPLE 10-3

package { import com.actionscriptbible.Example; import flash.display.Sprite; public class ch10ex3 extends Example { public function ch10ex3() { var sprite:Sprite = new Sprite(); sprite.alpha = 1; trace("alpha" in sprite); //true, that s a property sprite.getChildByName("subclip"); trace("getChildByName" in sprite); //true, that s a method var person:Person = new Person("Ben"); trace("name" in person); //true, Person has a name trace("SSN" in person); //false, because it s private! trace("unicorn" in person); //false, that s just silly } } } class Person { public var name:String; private var SSN:Number;

public function Person(name:String) { this.name = name; } }

To add data to another worksheet in your workbook, click the worksheet tab to display the worksheet. To magnify your view of the worksheet, click and drag the Zoom slider.

This is a widely used identity. For example,

This example illustrates nding methods and properties in both built-in and custom classes. It also shows that in respects the visibility of properties. The old-school method of checking for existence by seeing if a lookup fails still works:

trace(notes["Josh"]); // Displays undefined if (notes["Josh"]) { trace(notes["Josh"]); } else { trace("I haven t met Josh yet."); } // Displays: I haven t met Josh yet.

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