Consider this rather silly snippet:
3.times do |round|
cell = uninitialized Int32
if cell == 60
puts "cell = 60, round = #{round}"
puts " (by chance!)" if round == 0
end
cell = 60
endDoes every iteration create cell again, coincidentally placing it at the address used by cell on the preceding iteration (which would explain its value of 60 on the third pass)?
Or does one variable persist across all three iterations, so that I can rely on that?
With uninitialized, the variable refers to memory containing whichever data happens to be there already. That's precisely why uninitialized exists: it neither clears that memory nor assigns an initial default value.
Here, cell coincidentally resides at an identical address on every iteration. The way the stack operates probably makes this behaviour consistently observable, but depending on it would be a mistake. A single variable isn't persisting from one iteration to another.
If it chooses, the compiler / code generator may rearrange where things live.
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