Sorry for the confusion.
This is not a bug.
Any member (function or property) outside of "initialize" is being put
onto constructor's prototype.
Any instance produced later by that constructor (class) shares those
members via its (instance) prototype chain (instance =>
<constructor>.prototype => Object.prototype)
You could think of these as static methods/properties.
Best,
kangax
On Jun 6, 8:36 pm, dynamo517 <[EMAIL PROTECTED]> wrote:
> Setup:
> I'm using prototype.js (1.6.0.2)
>
> Problem:
> Whether or not a class variable is static to a class or private to an
> instance of that class (object) is not consistent. Depending on the
> type of the variable and how it is initialized, results may vary.
>
> Here's an example:
>
> var PersonClass1 = Class.create
> (
> {
> jobs: 0,
> friends: [],
> favoriteThings: {},
> initialize: function()
> {
> }
> }
> );
>
> var PersonClass2 = Class.create
> (
> {
> initialize: function()
> {
> this.jobs = 0;
> this.friends = [];
> this.favoriteThings = {};
> }
> }
> );
>
> //Define a couple instances of PersonClass1
> var Bob = new PersonClass1();
> Bob.jobs++;
> Bob.friends.push('Sal', 'Cal');
> Bob.favoriteThings['movie'] = 'Office Space';
> alert(Bob.jobs);//1 as expected
> alert(Bob.friends.length);//2 as expected
> alert(Object.keys(Bob.favoriteThings).length);//1 as expected
>
> var Ted = new PersonClass1();
> Ted.jobs++;
> Ted.friends.push('Ron', 'Jon');
> Ted.favoriteThings['candy'] = 'Good n Plenty';
> alert(Ted.jobs);//1 as expected
> alert(Ted.friends.length);//4 as UNEXPECTED
> alert(Object.keys(Ted.favoriteThings).length);//2 as UNEXPECTED
>
> //Define a couple instances of PersonClass2
> var Amy = new PersonClass2();
> Amy.jobs++;
> Amy.friends.push('Ken', 'Ben');
> Amy.favoriteThings['sport'] = 'Football';
> alert(Amy.jobs);//1 as expected
> alert(Amy.friends.length);//2 as expected
> alert(Object.keys(Amy.favoriteThings).length);//1 as expected
>
> var Ana = new PersonClass2();
> Ana.jobs++;
> Ana.friends.push('Pat', 'Sue');
> Ana.favoriteThings['wine'] = 'Cabernet';
> alert(Ana.jobs);//1 as expected
> alert(Ana.friends.length);//2 as expected
> alert(Object.keys(Ana.favoriteThings).length);//1 as expected
>
> As you can see, the outcomes are different depending on two things:
> 1) class variable type
> 2) class variable initialization
>
> I'm not sure if this is a bug or not. I haven't seen any
> documentation (please enlighten me) that warns of this or recommends
> the "safe" way to initialize class variables by ONLY using the
> initialize method.
>
> I'm okay with using the initialize method only, but I just hope this
> doesn't bite anybody else in the future like it did me.
>
> Thoughts?
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