Hi Jakob,
This is a good idea, but unfortunately my existing code relies on the eval-like
nature of fragments, in that they "return" whatever the last line in the script
evaluates to. e.g. the script
7 + 6
evaluates as 13. But the function
f = function() {
7 + 6;
}
f()
evaluates as undefined because it is missing a return statement.
Oliver
On 16 Jul 2014, at 5:56 pm, Jakob Kummerow <[email protected]> wrote:
> 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 <[email protected]> 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(), but that
> function no longer exists.)
>
> I can manually iterate over the global object and clean up after myself (as
> this guy does), 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.
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