2015-01-19-165239_nazo_each_with_object.rb

def hr
  puts '-' * 50
end

a = [10,100,1000].each_with_object(2)
b = [10,100,1000].map{|x|[x,2]}.map

p a.class
p b.class

hr

p a.inspect
p b.inspect

hr

p [a.first, a.first.class]
p [b.first, b.first.class]

hr

p a.to_a
p b.to_a

hr

p a.map(&:to_s)
p b.map(&:to_s)