Simple Ruby meta programming example

meta_ruby.rb

class Meta
  def self.make_method(meth_name)
    define_method meth_name do |adjective|
      puts "#{meth_name} is a #{adjective} method name"
    end
  end

  def method_missing(meth, *args, &block)
    puts "Method #{meth} is not defined on this class"
    self.class.make_method(meth)
  end
end

m = Meta.new
Meta.make_method('my_method') # => Define method named 'my_method'
m.my_method('fine')           # => 'my_method is a fine method name a'
m.my_method('nice')           # => 'my_method is a nice method name a'
m.mm('missing')               # => Hits method missing
m.mm('previously missing')    # => 'mm is a previously missing method name'
Meta.make_method('abc')       # => Define method named 'abc'