public virtual bool HasInstance(ExecutionContext GLOBAL, object ob)
{
if (ob == null || ob is JSUndefined || ob is bool || ob is double || ob is string)
{
return(false);
}
object o = this.GetItem(GLOBAL, "prototype").GetValue(GLOBAL);
if (o == null || o is JSUndefined || o is bool || o is double || o is string)
{
throw new TypeError(Class + " is not a progenitor in this case");
}
do
{
ob = JSObject.GetPrototype(GLOBAL, ob);
if (o == ob)
{
return(true);
}
}while (ob != null);
return(false);
}