Prototype class-instances sharing properties

[Luke]

Hi,

I've got a weird behavior here, or rather a behavior I don't
understand. If you take the following Class:

---
var SomeClass = Class.create({

rbBuffer: nulll,

setBuffer: function(val) {
this.rbBuffer = val;
},

getBuffer: function() {
return this.rbBuffer;
}
});
---

and play around a little bit:

---
var c1 = new SomeClass();
var c2 = new SomeClass();

c1.setBuffer(true);
c2.setBuffer(false);

log(c1.getBuffer()); // PRINTS TRUE
log(c2.getBuffer()); // PRINTS FALSE
---

everything works as expected. But if you alter that class and make
rbBuffer a JSON-object and try to set/get properties of that object,
it kinda gets shared:

---
var SomeClass = Class.create({

rbBuffer: {},

setBuffer: function(val) {
this.rbBuffer.test = val;
},

getBuffer: function() {
return this.rbBuffer.test;
}
});

var c1 = new SomeClass();
var c2 = new SomeClass();

c1.setBuffer(true);
c2.setBuffer(false);

log(c1.getBuffer()); // PRINTS FALSE
log(c2.getBuffer()); // PRINTS FALSE
---

rbBuffer.test of the first object is overwritten with the value you
set on the second object, as if the use the same variable.

Does anyone know why this is, and how to work with it?

Thanks
Lukas

[yuval dagan]

Hi

 

currently the rdBuff is shared between all instatces

try to create the instance variable (here rdBuff) inside the initialize function

and with the this keyword its not default  like in C++ etc...

 

 

var SomeClass = Class.create({
 initialize: function(name) {
    this.rbBuffer = {};
  },

 

 setBuffer: function(val) {
   this.rbBuffer.test = val;
 },

.

.

.

 

 

hope it helped

 

cheers

 

yuval

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[Luke]

Will try that, thank you yuval

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