[jQuery] Re: inArray not working with dates

This is nothing specific to dates.

Every time you use the 'new' operator, you get a new object.

When you use == or === to compare two objects, it doesn't mean "tell me if
these two objects represent the same underlying value". It means "tell me if
these are two references to *the same object*".

For example:

  function Foo() {}
  var f1 = new Foo;
  var f2 = new Foo;
  var f3 = f1;

  alert( f1 == f2 );  // false - two different objects
  alert( f1 == f3 );  // true - both are references to the same object

-Mike

> From: Fontzter
> 
> Well, I guess this is intrinsic to javascript.  I didn't know 
> that date compares were not reliable.  Seems to work with 
> milliseconds though.  Learn something new every day.
> 
> var dt1 = new Date(2009,7-1,31);
> var dt2 = new Date(2009,7-1,31);
> alert(dt1 === dt2); //false
> alert(dt1 == dt2); //false
> alert(dt1.getTime() === dt2.getTime()); //true
> 
> Dave
> 
> 
> On Jul 31, 10:16 am, Fontzter <dmfo...@xxxxxxxxx> wrote:
> > Can someone tell me what I may be doing wrong here?
> >
> >         var dateList = new Array();
> >         dateList.push(new Date(2009,7-1,29));
> >         dateList.push(new Date(2009,7-1,30));
> >         dateList.push(new Date(2009,7-1,31));
> >         var testdate = new Date(2009,7-1,30);
> >         alert($.inArray(testdate,dateList)); //returns -1  ????
> >
> > tia,
> >
> > Dave
>