Derive the source of the ruby ​​method

Question

Let's say I create a class using the method in it.

class A def test puts 'test' end end 

I want to know what happens inside test . I want to literally output:

 def test puts 'test' end 

Is there a way to output the method source to a string?

Answer 1

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) 

Then run ruby myfile.rb and you will see:

 def test return 'test' end