Ruby, iOS, and Other Development

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2006-06-11

Class#extract_instance_method and Object#extract_singleton_method

This is sort of kinky, but sometimes it's just what you need. Particularly when extending (rather than including) modules, it is sometimes desirable to preserve, but remove, an existing method. To that end I present:

class Module
  def extract_instance_method(sym)
    if instance_methods(false).include? sym.to_s
      method = instance_method(sym)
      remove_method(sym)
      method
    else
      nil
    end
  end
end

class Object
  def extract_singleton_method(sym)
    metaclass = class << self; self; end
    if method = metaclass.extract_instance_method(sym)
      method.bind(self).to_proc
    else
      nil
    end
  end
end
Enjoy!

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