GarbageCollect
From Spheriki
GarbageCollect invokes SpiderMonkey's garbage collection routine, which will destroy any unused objects, freeing their memory.
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Usage
GarbageCollect();
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Notes
GarbageCollect will usually not be needed for most games. You should consider using it if your game creates and destroys a lot of objects in a short space of time and appears to be taking up more memory than it should. In this case, adding a call to GarbageCollect may help.
