On 5/22/06, Grzesiek Slusarek <[EMAIL PROTECTED]> wrote:
Hello all. I'm writing my own object using prototype and I
wonder how you write and call only one instance of class. Can
anyone share his idea of singleton?
thanks
Gregor
Here is my proposal :
---8<----------------------
<script>
var Foo = Class.create();
Object.extend(Foo.prototype, {
initialize: function() {
this.a = 5;
}
});
Object.extend(Foo, {
instance: function() {
if (!this._instance) {
this._instance = new Foo();
}
return this._instance;
}
});
var o1 = Foo.instance();
var o2 = Foo.instance();
alert(o1.a + ' ' + o2.a);
o2.a = 10;
alert(o1.a + ' ' + o2.a);
</script>
---8<----------------------
Anyway it is not a real singleton since it is possible to call the
constructor outside from instance()
Furthermore, by hacking Foo, I do not know if I break something by
adding _instance and instance() :-\
Yours,
Nicolas Terray
_______________________________________________
Rails-spinoffs mailing list
[email protected]
http://lists.rubyonrails.org/mailman/listinfo/rails-spinoffs
