Packageflash.utils
Classpublic dynamic class Dictionary
InheritanceDictionary Inheritance Object

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0 Flash Player 9

The Dictionary class lets you create a dynamic collection of properties, which uses strict equality (===) for key comparison. When an object is used as a key, the object's identity is used to look up the object, and not the value returned from calling toString() on it. Primitive (built-in) objects, like Numbers, in a Dictionary collection behave in the same manner as they do when they are the property of a regular object.

The following statements show the relationship between a Dictionary object and a key object:

 var dict:Dictionary = new Dictionary();
 var obj:Object = new Object();
 var key:Object = new Object();
 key.toString = function() { return "key" }
  
 dict[key] = "Letters";
 obj["key"] = "Letters";
  
 dict[key] == "Letters"; // true
 obj["key"] == "Letters"; // true 
 obj[key] == "Letters"; // true because key == "key" is true because key.toString == "key"
 dict["key"] == "Letters"; // false because "key" === key is false
 delete dict[key]; //removes the key

Important:The Dictionary class is only available to ActionScript 3.0 code (running in SWF content). It is not available to JavaScript code (running in Adobe® AIR™).

See also

=== (strict equality)

Public Properties
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
Public Methods
 MethodDefined By
  
Dictionary(weakKeys:Boolean = false)
Creates a new Dictionary object.
Dictionary
 Inherited
hasOwnProperty(name:String):Boolean
Indicates whether an object has a specified property defined.
Object
 Inherited
isPrototypeOf(theClass:Object):Boolean
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
propertyIsEnumerable(name:String):Boolean
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
toLocaleString():String
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
toString():String
Returns the string representation of the specified object.
Object
 Inherited
valueOf():Object
Returns the primitive value of the specified object.
Object
Constructor Detail
Dictionary()Constructor
public function Dictionary(weakKeys:Boolean = false)

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0 Flash Player 9

Creates a new Dictionary object. To remove a key from a Dictionary object, use the delete operator.

Parameters
weakKeys:Boolean (default = false) — Instructs the Dictionary object to use "weak" references on object keys. If the only reference to an object is in the specified Dictionary object, the key is eligible for garbage collection and is removed from the table when the object is collected.



© 2009 Adobe Systems Incorporated. All rights reserved.
Wed Jul 29 2009, 04:58 PM -07:00
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