gistfile1.rb

p '----- shallow'

data = [1,2,3,4,5,6]

p "raw_data: #{data}"
p '- processing'
new_data =
  data.each_with_object([]) do |d, ret|
    ret << d * 2
  end

p "raw_data: #{data}"
p "new_data: #{new_data}"

p '=========='

p '----- deep'

data = [[1,2,3],[4,5,6]]

p "raw_data: #{data}"
p '- processing'

new_data =
  data.each_with_object([]) do |_data, ret|
    ret << _data.map! {|d| d * 2}
  end

p "raw_data: #{data}"
p "new_data: #{new_data}"

gistfile2.txt

"----- shallow"
"raw_data: [1, 2, 3, 4, 5, 6]"
"- processing"
"raw_data: [1, 2, 3, 4, 5, 6]"
"new_data: [2, 4, 6, 8, 10, 12]"
"=========="
"----- deep"
"raw_data: [[1, 2, 3], [4, 5, 6]]"
"- processing"
"raw_data: [[2, 4, 6], [8, 10, 12]]"
"new_data: [[2, 4, 6], [8, 10, 12]]"