gistfile1.rb

irb(main):020:0* class Foo
irb(main):021:1>   def def_methods
irb(main):022:2>     method_name = "meth-#{rand(1000)}"
irb(main):023:2>     self.class.class_eval do
irb(main):024:3*       define_method method_name do
irb(main):025:4*         method_name.to_s.capitalize
irb(main):026:4>       end
irb(main):027:3>     end
irb(main):028:2>   end
irb(main):029:1> end
=> nil
irb(main):030:0> 
irb(main):031:0* foo=Foo.new
=> #<Foo:0x00000001dabdc0>
irb(main):032:0> foo.def_methods
=> #<Proc:0x00000001d35a30@(irb):24 (lambda)>
irb(main):033:0> foo.methods.grep /meth-/
=> [:"meth-226"]
irb(main):034:0> 
irb(main):035:0* foo2=Foo.new
=> #<Foo:0x00000001b0e928>
irb(main):036:0> foo.def_methods
=> #<Proc:0x000000021afbb0@(irb):24 (lambda)>
irb(main):037:0> foo.methods.grep /meth-/
=> [:"meth-226", :"meth-246"]
irb(main):038:0> 
irb(main):039:0* foo2.methods.grep /meth-/
=> [:"meth-226", :"meth-246"]