ruby - Ruby：遍历常量

Question

我刚刚开始在 Ruby 中使用常量。

我有

module Constants
  C1 = "foo"
  C2 = "bar"
end

我想要做

Constants.each do |c|
  #do something with each one
end

但它说

undefined method ‘each’ for Constants::module

……

有没有一种迭代常量列表的好方法？

Answer 1

module Constants
  C1 = "foo"
  C2 = "bar"
end

Constants.constants.each do |c|
  puts "#{c}: #{Constants.const_get(c)}"
end
#=> "C1: foo"
#=> "C2: bar"