Enumerating... or else

otherwise_enumerable.rb

# Written based on a conversation about enumerating with behavior for
# empty collections
#
# https://ruby.social/@pushcx/113397079757804801
# https://www.justinweiss.com/articles/each-dot-dot-dot-or-else/

module OtherwiseEnumerable
  refine Enumerable do
    def otherwise
      return yield if empty?
      self
    end
  end
end
using OtherwiseEnumerable

[1, 2, 3].select(&:odd?).otherwise { [42] }.each { |x| puts x }
[2, 2, 4].select(&:odd?).otherwise { [42] }.each { |x| puts x }