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With minimum modification to your code, this should work (but this is still a pretty odd way to write a function) X := (v = 1; While[v > 0.1, v = RandomVariate[UniformDistribution[{0, 1}], 1][[1]]; Print["~", v]]; v) X


The # represents the variable and the & indicates a pure function. The _ in _? represents an arbitrary pattern and the _? indicates a query with an answer of either True or False. So your code can be "read" as: Search the given list of integers for elements that fit the pattern for which the pure function "is it greater than 7" yields True, and return ...

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