Web Reference: A range can be both beginless and endless. For literal beginless, endless ranges, at least the beginning or end of the range must be given as an explicit nil value. It is recommended to use an explicit nil beginning and end, since that is what Ruby uses for Range#inspect: Ruby core classes that do so include Array, Complex, File::Stat, Float, Integer, Kernel, Module, Numeric, Rational, String, Symbol, and Time. Example: A range can be iterated over only if its elements implement instance method succ. In Ruby, this concept is reified into a first-class object called the Range. A Range represents an interval—a set of values with a start and an end.
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