ruby methods that either yield or return Enumerator

Question

in recent versions of Ruby, many methods in Enumerable return an Enumerator when they are called without a block:

[1,2,3,4].map 
#=>         


        

Answer 1

easiest way for me

class Array
  def iter
      @lam = lambda {|e| puts e*3}
      each &@lam
  end
end

array = [1,2,3,4,5,6,7]
array.iter

=> 3 6 9 12 15 18 21