what about
o.constructor.prototype == c.prototype
On Apr 18, P T Withington wrote:
> o.__proto__ == c.prototype
>
> is usually equivalent to:
>
> o instanceof c
>
> except in the case where you are trying to see if o is a _direct_ instance of
> c. But that does not seem to be the case here.
>
> I cannot find a way in ECMA to ask if something is a direct instance of a
> class. both instanceof and isPrototypeOf test for direct and indirect
> inheritance.
>
> On 2006-04-18, at 11:27 EDT, Henry Minsky wrote:
>
> > This code in LzDataElement tries to classify an object arg, o, by looking at
> > it's __proto__ field.
> > Do we have protocol for finding object's class type that doesn't rely on
> > __proto__ (which won't work
> > in IE 6 javascript, I believe)
> >
> >
> >
> > LzDataElement.__LZv2E = function ( o ) {
> >
> > var type = typeof( o );
> > type.toLowerCase();
> >
> > var c = [];
> > if (type == "object") {
> > var proto = o.__proto__;
> > if ( proto == LzDataElement.prototype ||
> > proto == LzDataNode.prototype ) {
> > c[0] = o;
> > } else if (proto == Date.prototype) {
> >
> > type = "date";
> > // FIXME: [2004-04-10 pkang] what should we do with dates?
> >
> > } else if (proto == Array.prototype) {
> > type = "array";
> > var tag = (o.__LZtag != null ? o.__LZtag : 'item');
> > for (var i=0; i < o.length; i++) {
> > var tmpC = this.__LZv2E( o[i] );
> > c[i] = new LzDataElement(tag, null, tmpC );
> > }
> > } else {
> > type = "struct";
> > var i = 0;
> > for (var k in o) {
> > // skip any properties that start with __LZ
> > if (k.indexOf('__LZ') == 0) continue;
> > c[i++] = new LzDataElement(k, null, this.__LZv2E(o[k]));
> > }
> > }
> > } else if (o != null) {
> > c[0] = new LzDataText( o );
> > }
> >
> > if (c.length == 0) c = null;
> >
> > return c;
> > }
> >
> > --
> > Henry Minsky
> > Software Architect
> > [EMAIL PROTECTED]
>
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