Allow hash or array for a loop

hash_or_array.rb

def hash_or_array(obj)
  obj.each do |k,v=k|
    puts "k: #{k}","v: #{v}"
  end
end

hash_or_array([1,2,3])
# k: 1
# v: 1
# k: 2
# k: 2
# k: 3
# k: 3

hash_or_array(a:1,b:2,c:3)
# k: a
# v: 1
# k: b
# v: 2
# k: c
# v: 3