In Ruby, why does Array.new(size, object) create an array consisting of multiple references to the same object?

Question

As mentioned in this answer, Array.new(size, object) creates an array with size references to the same object.

hash =          


        

Answer 1

I came up with this answer, very short and simple solution

c_hash = Hash.new
["a","b","c","d","e","f"].each do |o|
  tmp = Hash.new
  [1,2,3].map {|r| tmp[r] = Array.new}
  c_hash[o] = tmp
end
c_hash['a'][1] << 10
p c_hash