Ruby sum array of object map reduce style

ruby_sum_object_array.rb

Class A
  attr_accessor :name, :value
  
  def initialize
    @value = rand(10)
    @name = "Mr. #{@value}_#{rand(100)}"
  end
end

a = Array.new(10).collect { |e| e = A.new }

a.map(&:value).inject(&:+)