RosettaCodeData/Task/Sort-an-integer-array/Crystal/sort-an-integer-array.cr

a = [5, 4, 3, 2, 1]
puts a.sort
# => [1, 2, 3, 4, 5]

puts a
# => [5, 4, 3, 2, 1]

a.sort!
puts a
# => [1, 2, 3, 4, 5]