如何检查方法的关键字参数

Question

鉴于以下Ruby 2.x方法，我如何检查关键字参数？

def for_account(token_id: nil, email: nil, password: nil)
  puts "arguments are: ??"
end

Answer 1

def for_account(token_id: nil, email: nil, password: nil)
  puts "arguments are: ??"
end

p method(:for_account).parameter
# => [[:key, :token_id], [:key, :email], [:key, :password]]