Greg Young's Probability Kata
| Value objects are an important concept in DDD. This kata is made both to learn value objects and to learn better ways of testing. | |
| Write a probability value object. It should contain the following methods: | |
| Probability CombinedWith(Probability) | |
| Probability InverseOf() | |
| Probability Either(Probability) | |
| if you forget your probability math: | |
| Either:P(A) + P(B) - P(A)P(B) | |
| CombinedWith: P(A)P(B) | |
| InverseOf: 1 - P(A) | |
| The math is surprisingly not the main part of the exercise. | |
| The internal state should be held as a decimal. Use TDD when writing this object. | |
| One last thing. You can't put any getters on the object. What's the first test to write? | |
| When finished continue reading: https://gist.github.com/1018566 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment