Some ways to sort arrays in Ruby. Copy and paste the code examples in the irb console to try them.

array_sorting.rb

array = [3,7,1,9,2,12,34,0]

# sort in ascending order
array.sort
# => [0, 1, 2, 3, 7, 9, 12, 34]

# sort in descending order
array.sort.reverse
# => [34, 12, 9, 7, 3, 2, 1, 0]

array.sort { |a,b| b <=> a }
# => [34, 12, 9, 7, 3, 2, 1, 0]