This is an update to my previous article: Making methods immutable in Ruby.

By popular demand, I’ve made my Immutable module raise an exception, by default, if you try to override an immutable method.

So, the following:

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require 'rubygems'
require 'immutable'

module Foo
  include Immutable

  def foo
    :foo
  end

  immutable_method :foo
end

module Foo                                      
  def foo                                       
    :baz                                        
  end                                           
end

Will raise an error: 



Cannot override the immutable method: foo (Immutable::CannotOverrideMethod)