How about wrapping the fragments in anonymous closures? Roughly:
script_to_execute = "(function() {" + fragment + "})();";
That should get you most of what you want, except for undoing
monkey-patching of Array.prototype and stuff, but maybe that's good enough,
and it's certainly easy and fast.
On Wed, Jul 16, 2014 at 8:35 AM, Oliver Bock <oli...@g7.org> wrote:
> What is the most efficient way to clean up the global object between
> running fragments of JavaScript?
>
> I am running a fragment of JavaScript in a tight loop to make a simple
> calculation for each of hundreds of thousands of inputs. I don't want
> variables set by one execution to bleed into the next.
>
> My first thought was to try to swap in a different global object for each
> v8 iteration, but I can find no mechanism to do that. (Earlier versions of
> v8 might have supported it via something like Context.ReattachGlobal()
> <https://groups.google.com/forum/#!msg/v8-users/FfqgU3jEKf4>, but that
> function no longer exists.)
>
> I can manually iterate over the global object and clean up after myself
> (as this guy does
> <https://groups.google.com/forum/#%21topic/v8-users/q2CDsy58Dcc>), but my
> JavaScript fragments are fairly simple and the cleanup dominates execution
> time (because v8 is so fast).
>
> I think recreating the Context each time will be even slower than this.
> particularly because I will need to repopulate it with various objects.
>
>
> Oliver
>
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