输出红宝石方法的来源 [英] Output the source of a ruby method

问题描述

说我在其中创建一个带有方法的类.

Say I make a class with a method in it.

class A
  def test
    puts 'test'
  end
end

我想知道test内部的情况.我想从字面上输出:

I want to know what goes on inside of test. I want to literally output:

def test
  puts 'test'
end

有没有办法以字符串形式输出方法的来源?

Is there any way to output the source of a method in a string?

推荐答案

您可以使用撬进行查看方法

You can use Pry to view methods

# myfile.rb
require 'pry'
class A
   def test
     return 'test'
   end
end
puts Pry::Method(A.new.method(:test)).source      #(1)
# or as suggested in the comments
puts Pry::Method.from_str("A#test").source        #(2)
# uses less cpu cycles than #(1) because it does not call initialize - see comments
puts Pry::Method(A.allocate.method(:test)).source #(3)
# does not use memory to allocate class as #(1) and #(3) do
puts Pry::Method(A.instance_method(:test)).source      #(4)

然后运行ruby myfile.rb，您将看到:

def test
   return 'test'
end

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