@Adrian Olaru: To reiterate what Peter and Miller said, these kind are
differences are insignificant.

I remember running across this jsperf test a few days ago.
The results are indistinguishable from each other and are of such a
high ops/sec rate that any minor difference is overlooked.
http://jsperf.com/vars

In FF 3.6.11 the tests are executed ~6.2 million times in ~30
milliseconds and repeated ~120 times.
These kind of nano-optimizations rarely have an effect on applications/
projects as a whole and vary from browsers/environments due to engine
optimizations.

- JDD

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