gmodarelli · August 29, 2015 14:08
diff --git a/default_value.rb b/default_value.rb
 define_method(abbr) { |date = nil| DatePart.new(abbr, date) }
diff --git a/group_by.rb b/group_by.rb
 names = [ 'Giuseppe', 'Giulia', 'Luca', 'Andrea', 'Roberto' ]
 grouped_by_first_letter = names.group_by { |name| name[0] }

 puts grouped_by_first_letter
 # >> {"G"=>["Giuseppe", "Giulia"], "L"=>["Luca"], "A"=>["Andrea"], "R"=>["Roberto"]}
diff --git a/module_eval.rb b/module_eval.rb
 module MyModule
  chars = %w(A B C)
  words = chars.permutation.to_a
  
  words.each do |word|
    method_name = word.join
    module_eval(<<-PERMUTATION, __FILE__, __LINE__)
      def #{method_name}
        puts "#{word}"
      end
    PERMUTATION
  end
 end

 include MyModule

 abc  # => nil
 # >> a
 # >> b
 # >> c
diff --git a/words_generator.rb b/words_generator.rb
 chars = %w(A B C)
 words = chars.permutation.to_a
 # => [["A", "B", "C"],
 #     ["A", "C", "B"],
 #     ["B", "A", "C"],
 #     ["B", "C", "A"],
 #     ["C", "A", "B"],
 #     ["C", "B", "A"]]
diff --git a/words_generator_2.rb b/words_generator_2.rb
 chars = %w(A B C)
 words = chars.permutation(2).to_a
 # => [["A", "B"], ["A", "C"], ["B", "A"], ["B", "C"], ["C", "A"], ["C", "B"]]
	names = [ 'Giuseppe', 'Giulia', 'Luca', 'Andrea', 'Roberto' ]
	grouped_by_first_letter = names.group_by { \|name\| name[0] }

	puts grouped_by_first_letter
	# >> {"G"=>["Giuseppe", "Giulia"], "L"=>["Luca"], "A"=>["Andrea"], "R"=>["Roberto"]}
	module MyModule
	chars = %w(A B C)
	words = chars.permutation.to_a

	words.each do \|word\|
	method_name = word.join
	module_eval(<<-PERMUTATION, __FILE__, __LINE__)
	def #{method_name}
	puts "#{word}"
	end
	PERMUTATION
	end
	end

	include MyModule

	abc # => nil
	# >> a
	# >> b
	# >> c