gistfile1.rb

# what is the idiomatic ruby for this:
# if the var is an array, do_something with each element, otherwise just do something with the var
# if var.is_a?(Array)
#   var.each do |element|
#     do_something(element)
#   end
# else
#   do_something(var)
# end

class Object
  def for_this_or_each(&block)
    # make work for any enumerable, not just arrays
    if respond_to? :each
      each &block
    else
      block.call self
    end
  end
end

var.for_this_or_each { |o| do_something(o) }