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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