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Created August 30, 2016 14:00
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A sample on using force-unwrap against an String optional.
name = "Ol' Man Jenkins"
// This call will work, since it has a valid value.
print(createGreetings(sailorName: name!))
name = nil
// This call will cause an error, since `name` has no value at this point.
print(createGreetings(sailorName: name!))
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