Hi,
there can be a difference between them depending on the further usage of your myClass variable. If you don't use this variable in further steps there's no problem to put it into the for-loop.
From an optimization point of view I would prefer the first one, because this variable must not be instantiated every time your loop goes a step further. From a readability point of view the second option would be better (R# would suggest to go for the second option). Anyway, that will give you, if any, just a small performance boost. There are other things you should more care about when looking for performance optimization.
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