Ruby: hiding method from an instance

This one is simple, for some reason I needed to hide a method from an instance so people would use my wrapper instead of the method directly - I have good reasons, but to achieve this we can, again, resort to instance_eval:

irb(main):001:0>  class A

irb(main):002:1>  def a

irb(main):003:2>  p 'hello world'

irb(main):004:2>  end

irb(main):005:1>  end

=> nil

irb(main):006:0> 

irb(main):007:0*  a = A.new

=> #<A:0x0000001fbee140>

irb(main):008:0>  a.instance_eval do 

irb(main):009:1*  alias :b :a

irb(main):010:1> def a

irb(main):011:2> p 'you should not use this method'

irb(main):012:2> end

irb(main):013:1> end

=> nil

irb(main):014:0> a.a

"you should not use this method"

=> "you should not use this method"

irb(main):015:0> a.b

"hello world"

=> "hello world"

Codebits 2012 Talk preview

I decided I'd not be myself if I did not add some humour and memes to the presentation. So here's the first one I've come up with: