Standard builtins' prototypes and toString

Erik Arvidsson erik.arvidsson at
Thu Jun 12 08:57:47 PDT 2014

On Thu Jun 12 2014 at 11:28:12 AM, C. Scott Ananian <ecmascript at>

> It would be slightly more "JavaScripty" to have
> Date.prototype.[[DateValue]] exist, and be set to the epoch or some
> such.


1. Let date be the this value.
2. If Type(date) is not Object then, throw a TypeError exception.
3. If date does not have a [[DateValue]] internal slot, then let tv be NaN
4. Else let tv be this time value.
5. Return ToDateString(tv).

Allen, what is the benefit to do `super.toString()` instead?

> This problem actually seems to be an artifact of the way that
> [[Construct]] works in ES6 -- but the takeaway is that prototypes of a
> class are not themselves instances of the class.  It's not surprising
> that methods of the class thus don't work on the prototype.  I'd vote
>   --scott
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