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Instance Public methods

sole()

Returns the sole item in the range. If there are no items, or more than one item, raises Enumerable::SoleItemExpectedError.

(1..1).sole   # => 1
(2..1).sole   # => Enumerable::SoleItemExpectedError: no item found
(..1).sole    # => Enumerable::SoleItemExpectedError: infinite range cannot represent a sole item

Source: show | on GitHub 

# File activesupport/lib/active_support/core_ext/range/sole.rb, line 10
def sole
  if self.begin.nil? || self.end.nil?
    raise ActiveSupport::EnumerableCoreExt::SoleItemExpectedError, "infinite range '#{inspect}' cannot represent a sole item"
  end

  super
end