hash_foo.rb

h = {:a => 1, :b => 2, :c => 3}

h.each do |pair|
  # pair is an Array
  puts "key: #{pair.first}, value :#{pair.last}"
end

h.each do |key, value|
  puts "key: #{key}, value :#{value}"
end

# Expected output
#
# key: c, value :3
# key: a, value :1
# key: b, value :2
# key: c, value :3
# key: a, value :1
# key: b, value :2