如何在Ruby中实现选项哈希？ [英] How to implement options hashes in Ruby?

问题描述

我如何实现选项哈希？一个具有选项散列的类的结构如何？假设我有一个人课程。我想实现一个方法，比如my_age，当被调用时会使用选项哈希来告诉我我的年龄。

How can I implement options hashes? How is the structure of a class that has option hashes in it? Say I have a person class. I want to implement a method such as my_age that when called upon will tell me my age using options hashes.

推荐答案

您可以这样做：

You could do something like this:

class Person

  def initialize(opts = {})
    @options = opts
  end

  def my_age
    return @options[:age] if @options.has_key?(:age)
  end

end

现在你可以打电话到这样的年龄了

and now you're able to call to the age like this

p1 = Person.new(:age => 24)<br/>
p2 = Person.new

p1.my_age # => 24<br/>
p2.my_age # => nil

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