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mastermind's Introduction

This is an alternative solution to the Mastermind problem that Uncle Bob solves in his excellent video [Clean Code, Episode 9 - The Single Responsibility Principle](http://www.cleancoders.com/codecast/clean-code-episode-9/show "Clean Coders").

I wrote this as a demonstration of how much better the code turns out to be when you explicitly try to model problem domain concepts in your objects.

To run the tests

ruby test_suite.rb

To play:

ruby run.rb

Choose a four-letter code with letters from A to F, answer a "+" for any letter that matches both letter and position, and "-" for any letter that matches the letter but not the position. Example run:

# I chose AFAB

$ ./run.rb 
Enter score for AAAA
++
Enter score for AABB
+-+
Enter score for ACAB
+++
Enter score for ADAB
+++
Enter score for AEAB
+++
Enter score for AFAB
++++
Game Over!

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