Add a new method with module_eval : module_eval « Reflection « Ruby

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Ruby » Reflection » module_eval

Add a new method with module_eval





class String

  module_eval %{def last(n)

                  self[-n, n]

                end}

end

p "Here's a string.".last(7)               # => "string."



String.module_eval %{def last(n)

                       self[-n, n]

                     end}



p "Here's a string.".last(7)               # => "string."

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Use module_eval to create dynamic method

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