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Duplicate object

 
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i11uminatus



Joined: 21 Aug 2003
Posts: 110
Location: Toronto, ON
PostPosted: Thu Sep 18, 2003 4:19 pm    Post subject: Duplicate object Reply with quote
Ok, there's probably some very simple way to do this...but I can't think of it!

Imagine I have an object. Let's call it "hoser" and give it a property.

hoser = new Object();
hoser.favDrink = "beer";

Now, I want to create some instances of other objects: Bob and Doug.

Bob = new Object();
Bob.type = hoser;
//
Doug = new Object();
Doug.type = hoser;

Now Bob and Doug both contain references to the hoser object as their "type".

So if we tried:
trace(Bob.type.favDrink);

We would get "beer" in the output.

Ok, now what if Doug changes his favorite drink to coffee?

If we say:
Doug.type.favDrink = "coffee";

We are essentially changing the property of the "hoser" object.
trace(Bob.type.favDrink);

would now get us "coffee" in the output!
But Bob still likes beer!

So...
Assuming I'm dealing with much more complicated objects and am passing in many properties, how do I then change the property in one object without changing it for all objects?

In other words, how do I make a duplicate of an object (give Bob and Doug each their own unique version of all the properties contained in "hoser") instead of a reference to it?

Thanks
i.
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K-dog
Moderator


Joined: 23 Jul 2002
Posts: 772
Location: Toronto, ON
PostPosted: Fri Sep 19, 2003 9:21 am    Post subject: Reply with quote
Excellent question... and I love the Bob and Doug theme!

Let's rework your code a little and see what we get. First let's create a hoser:

Code:
function Hoser(favDrink, hatColor, name) {
   this.favDrink = favDrink;
   this.hatColor = hatColor;
   this.name = name;
}


And now let's create Bob and Doug, giving them their own properties:

Code:
var hoserBob = new Hoser("beer", 0xFF0000, "Bob");
var hoserDoug = new Hoser("beer", 0x00FF00, "Doug");


Let's see if they have different names....

Code:
trace(hoserBob.name); // hey, his name is Bob!
trace(hoserDoug.name); //wow, it's Doug!


Now let's try to change Doug's favorite drink to coffee:

Code:
hoserDoug.favDrink = "coffee";
trace(hoserDoug.favDrink); // it's changed!
trace(hoserBob.favDrink); // he still loves beer!


Right on! Hope that helps, eh?

--K
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i11uminatus



Joined: 21 Aug 2003
Posts: 110
Location: Toronto, ON
PostPosted: Mon Sep 22, 2003 9:19 am    Post subject: Reply with quote
Thanks kristin,

I appreciate your response, and your class solution does give me some perpective, but at the moment I'm not sure it's applicable to this particular scenario.

I will think on it.

AUMMMMMMMMM

i.
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pedram



Joined: 26 Nov 2002
Posts: 111
Location: london
PostPosted: Mon Sep 22, 2003 8:11 pm    Post subject: Reply with quote
Don't know if this might be of any use to you:

if you goto http://proto.layer51.com/

and search under the objects catagory, theres some code by klitze7-c004
which might be usefull,

its called /// duplicate any given Object

the code allows you to duplicate an object and then reassign the variables within the new created object

this is the direct link to the prototype:

http://proto.layer51.com/d.aspx?f=446

but I havn't tested it myself
ped
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i11uminatus



Joined: 21 Aug 2003
Posts: 110
Location: Toronto, ON
PostPosted: Tue Sep 23, 2003 9:17 am    Post subject: Reply with quote
pedram,

Thank you for this useful link. I did eventually implement a for-in loop as a solution to my problem, creating a new object and reproducing each property of the target object, as in:
Code:
enemyType = {name:"enemy", speed:4, clipLink:"enemy"};
//
function buildCharacter(name, type){
   world[charName] = new Object();
   character.type = new Object();
   for (var i in type) {
      world[charName].type[i] = type[i];
   }      
}
This is a simplified version, of course.
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