I'm often seeing others using a Dictionary object in their AS3 code that simply maps objects by String keys and wondering if there is any advantage at all of using a Dictionary over a simple Object if String keys are used. Anyone know any details on this? I would suppose that since an Object is more lightweight it should be faster and preferable over a Dictionary if used with String keys.
View 1 RepliesI am encountering a problem in my app only when it is run in flash player 10.1.85.3. Some earlier player versions I have tried are working fine.From what I can tell it seems related to the following:
Quote:
from here: h[url].....
When searching for objects (not strings) in Dictionary objects using the 'in' operator, if the object is not found in the Dictionary object, it will be searched for in the delegate objects. With 10.1, the toString operator will be called on the Object if not found in the Dictionary. This can cause problems with Proxy objects who need to define the callProperty function or it will generate a RTE. ...what it means "it will be searched for in the delegate objects"?
What exactly is the difference between an object and a dictionary in Actionscript?
var obj:Object = new Object();
obj.something = "something";
var dict:Dictionary = new Dictionary();
dict.something = "something";
trace(obj.something, dict.something);
The trace statement seems identical...
So I am writing a program which uses Dictionary to store objects. For example
var dictionary:Dictionary=new Dictionary();
var myObject = new myObject(var1, var2, var3);
dicionary["key"]=myObject;
where var1, var2, and var3 are simply means of assigning values to variables in myObject.can I access values or functions that are found in myObject? In myObject class I have some getters and setters. Can I use a getter to get the value of var1 for example.
dictionary["keys"].getVar1()?
I'm trying to figure out a way to clone / copy a dictionary object.
I came across some articles on cloning that offer this code.
This does not seem to work for dictionary objects. I think it only really works for basic objects.
Has anybody come across a way of cloning a dictionary before
Code:
function clone(source:Object):*
{
var myBA:ByteArray = new ByteArray();
[Code].....
Why might it be useful to store an object (i.e. a Movieclip) as a key in a dictionary? Does any one have any examples of where it's used/is useful?
View 5 RepliesAny good argument as to why I shouldn't use a Dictionary over an Object every single time? I can't think of any case an Object can do the job a Dictionary can't, and it doesn't seem as the Dictionary creates that much more overhead.
View 8 RepliesIn one of the classes in my Flex application I have a dictionary, which is periodically updated from other parts of the application. It contains some sort of user preferences and I want to keep it in sync with a local shared object - the dictionary needs to be read during the class initialization and saved to the local storage when an element is changed, added or deleted.
The "Dictionary" object inherits only "Object" and does not have a change event - like the "collectionChange" in ArrayCollection. So I can't sync the dictionary just by listening for an event and manipulating the shared object in the event handler. The other possible solution would be to make the dictionary private and manipulate it using special methods in my class. Something like:
public function setValue(key:String, value:String):void
public function getValue(key:String):String
public function delValue(key:String):void
But using bindings will become a real nightmare and I will have to make changes in many other parts of the application.
My project is a visual way to represent a database of information about books. It will be represented as a collection of menus and submenus. From one menu, the user will be able to access another, from the other the third.Each item in a menu has some content, so the menus themselves are not a means to an end (to execute commands), but a goal in themselves. Viewing them, and browsing between them is the essence of the project.
The simplest way to organize a menu of items would be a dictionary object containing all its members.However, it is not really good for a complex set of menus and sub-menus which is a web of information linked between another.
whether using a String as the key in a Dictionary results in slower lookups than using an Object, Class or Custom Object (an instance of developer defined Type)?
When using a String as a key, does the literal String have to be parsed, or does the Dictionary key point to the String Object?
The dictionary use strict equals(===) for key comparison, how to change the comparison, so I can use my standard for comparison, for example, I have a class named Student:
class Student{
var id:int;
var name:String;[code]....
I want Dictionary use id to compare if the two keys are equal, not use strict equal(===) to compare if the key is the same.
The great thing about dictionary: one can use objects as keys. The bad thing: compiler still believes that the keys are strings.
[code]...
Normally in Flex you use a collection like ArrayCollection as the dataprovider for components. I often have data stored as a dictionary whose values I would like to use as a dataprovider.
View 2 RepliesI'm working with a large set of hierarchical taxonomic terms, where each term ("203") has a matching "term203" movie clip on the stage, and am having trouble getting a recursive function to return all of a given term's descendants.There is a main Dictionary() object with the following nested organization for each term:
{ [object Movie Clip] : { "tid":203, "parent":99, "name":"Culture", selected:false, "otherData":"etc" } }
...where the [object Movie Clip]'s instance name would be "term203". All of these object:subObjectArray items ("terms") are stored in a master taxonomy:Dictionary() object.I've been trying to make a recursive function (which is in itself already a little above my head) that takes the click.target of a movie clip and returns a new Dictionary() object with all of the children and grandchildren and great grandchildren (etc) of that term, in the same, nested organization described above.
The code below traces the right number of recursive loops, but the returned Dictionary() object only contains the first run's terms (only the immediate children of the requested term).
var taxonomy:Dictionary = new Dictionary();
// ...Term info is loaded into taxonomy from a JSON-style text file)
// ...MOUSE_OVER event listeners are added to each
[code]....
I certainly do not claim to be the most efficient AS3 programmer, so I am open to alternative configurations. However, after trying static and nested Arrays, I would prefer to continue using the Dictionary() object as my main pool.As noted, only the immediate children end up animating in the revealChildren() function. It's mystifying to me then, that in the getAllChildren() function, all of the descendants trace sequentially (well in no particular order) in the output window.Also I can't get any sort of name or property out of the subSet Object. That could be the problem.I've only tested it as far as 'two generations,' but it seems that only the first round of calling the function successfully adds those terms to the new Dictionary() object and returns it intact to the animating function.
why the Dictionary class ignores setPropertyIsEnumerable? I found this bug at bugs.adobe, seems the prototype might be involved in some devious way.Here is some test code:
var obj:Object = {
'a': 0,
'b': 1,[code]......
Notice that the Dictionary is still enumerating the property "a" even though it was told not to.
What is the correct way to determine if a Dictionary contains a particular key or not?
In Java I can do:
HashMap x= new HashMap();
x.containsKey("test"); // returns true/false
Is this the correct way in AS3?
var xictionary = new Dictionary();
x["test"] == null
[Code]...
in Java this: dict.keySet()
View 6 Repliessomehow plug a dictionary into flash which can be used to verify words in a word creation game I'd like to create..
Sounds perfectly feasible but I just wouldn't know where to start in finding it... are there ones which are readily available ?? (preferably free)
for (var k in dictionary)
{
var key:KeyType = KeyType(k);
var value:ValType = ValType(dictionary[k]); // <-- lookup
// do stuff
}
This is what I use to loop through the entries in a dictionary. As you can see in every iteration I perform a lookup in the dictionary. Is there a more efficient way of iterating the dictionary (while keeping access to the key)?
As the title suggests, is it possible to use AMF to encode/decode Dictionaries (without subclassing, that is)? For example, here's a test case:
[Code]...
Right now I am using ArrayCollection. But I want to change that to Set as I want make sure do duplicate values come.
var addressList:ArrayCollection = new ArrayCollection();
One way is I can use Dictionary and store addresses as a key. And I can just use keys to iterate. But I am looking for Java HashSet like implementation.
I am writing my destructor but I am not sure how to make sure that my Dictionary object is completely dismantled.
Do I just walk the keys and 'delete' the objects? If so do I need to destroy the keys? or are they already removed when the object is removed from the Dictionary?[code]...
I have an ARRAY which contains single symbols and DICTIONARY in where every symbol in array is attached to unique string, what I want to do - is to merge ARRAY and DICTIONARY together, and as a result receive RESULT_ARRAY where order of elements is equal to ARRAY but elements are replaced according to a DICTIONARY.
Code:
//for example
//this is what we have -
var originalA:Array = new Array ();
originalA[0]="y";
[code]...
I'm trying to do something along the following:
Code:
//Loop through all items in the dictionary to update each and every one
for (var key:DisplayObjectContainer in containerDict)
[code].....
Has anyone tried sending a Dictionary through the arguments of ExternalInterface.call()?What happens to it when it reaches the Javascript side, because from what I understand JavaScript does not have a Dictionary implementation.
View 4 RepliesIs there a way for flash to get the nature of a word (noun, verb, adverb, etc.) from a dictionary somewhere?
View 1 RepliesDoes Flex Dictionary maintain the order of its elements?
View 2 RepliesDoes Flash Actionscript have List and Dictionary equivalents? I've only found the documentation for the Array.
View 2 RepliesI am using Flex dictionary to store ValueObjects with Timestamp as the 'key' for each object.
Given a timestamp, I want to iterate over the dictionary starting from the given timestamp key value.
The Docs discuss the following for dictionary iteration, but this iterates from the first key-value pair.
for (var key:Object in myDictionary)
{
trace(key, myDictionary[key]);
}
In my parsley container, I'm instantiating an object 'A' that contains a Dictionary (flash.utils.Dictionary).
I would like to create this Dictionary using parsley and inject it to 'A'.
This dictionary pairs structure is: key=id of object 'B', value='B'
where object 'B' is also an object which is defined and created using parsley(so basically the pairs structure is and object id as a key and the object itself as the value).
Now, I have no problem creating 'A' and 'B', but can't seem to find the right way to create this dictionary using parsley, nor injecting it to 'A'.