Overriding Map/etc with get/set hooks?

Tab Atkins Jr. jackalmage at gmail.com
Mon May 20 23:17:33 PDT 2013


On Mon, May 20, 2013 at 11:10 PM, Sam Tobin-Hochstadt <samth at ccs.neu.edu> wrote:
> On Mon, May 20, 2013 at 10:32 PM, Tab Atkins Jr. <jackalmage at gmail.com> wrote:
>> All of these are easy to do if this is just a Map (or has Map on its
>> prototype chain), but with a custom [[MapData]] whose behavior is
>> defined by my spec.
>
> Would another way to think about this be as a regular plain-old Map,
> but which is updated imperatively by the environment sometimes, and is
> also read by the environment?

Sure, that's also valid.

> Or does changing the map also change
> some part of the style of the page _immediately_, rather than at the
> end of the turn?

It would be best if it happened immediately.  There's no
performance-related reason not to make it sync, and high potential for
confusion if you use one method to write it, another tool uses the
other method to read it, and they don't sync up.  It's just a
(necessary) convenience API for reading/writing the CSS properties
directly.

~TJ


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