Declaring something like a:this.b in prototype is of no use (because in
all cases it will be equivalent at the end to declare something like a:c
where c=("this" bounded object).b).
Intuitively, if we forget the specs and current behaviour, we could
think that doing such, "this" could have a chance to refer to the new
created object after the "new" statement, but of course it is not the case.
Instead we have to define getters and setters as mentionned below.
This can be compared to the var that/self=this trick in terms of
repeatability.
Something that is useless could be transformed to something usefull, but
right now I don't see a simple way to do it that creates more benefit
than harm.
Regards
A. Vitte
Le 15/02/2012 19:21, Aymeric Vitte a écrit :
I did not find any related subject in discussions or specs so here it
is :
var f=function(name) {
this._name=name;
};
f.prototype={
get nodeName() {return this._name},
get tagName() {return this._name},
get anotherNameInvention() {return this._name},
...
set nodeName() {},
set tagName() {},
set anotherNameInvention() {},
...
};
So in that case we have to define several getters and setters for
something that is refering to the same object, slowing down the
overall script execution, it would probably be better to have
something like :
f.prototype={
nodeName <operator> this._name,
tagName <operator> this._name,
anotherNameInvention <operator> this._name
...
}
var g=new f('test') --> g.nodeName is equal to g._name
While calling new the <operator> would indicate that g.nodeName must
be equal to g._name whether _name is a property or a method.
nodeName, tagName, etc could be defined in f but this does not solve
the case if we want them to be inherited properties.
Maybe no <operator> is required and the default behavior should be the
one described above (what could be the use of declaring something like
xxx : this.yyy in prototype ??? I have never seen it).
Example of use : js w3c dom implementation where objects own a lot of
redundant properties.
Regards
A. Vitte
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