Creating and iterating a 2d array in Ruby

Question

I have very little knowledge about Ruby and cant find a way to create 2d array. Can anyone provide me some snippets or information to get me started?

Answer 1

a = [[1, 2], [3, 4]]
a.each do |sub|
  sub.each do |int|
    puts int
  end
end
# Output:
#   1
#   2
#   3
#   4

or:

a = [[1, 2], [3, 4]]
a.each do |(x, y)|
  puts x + y
end
# Output:
#   3
#   7