Potentially uninitialized local variable

[bjormgyg]

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In Ruby, it is not necessary to explicitly initialize variables. If a local variable has not been explicitly initialized, it will have the value nil. If this happens unintentionally, though, the variable will not represent an object with the expected methods, and a method call on the variable will raise a NoMethodError.

In the following code, the call to create_file may fail and then the call f.close will raise a NoMethodError since f will be nil at that point.

def dump(x)
  f = create_file
  f.puts(x)
ensure
  f.close
end

References

Everything You Need To Know About Nil
NoMethodError