Greg Young's Probability Kata
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|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:|
|if you forget your probability math:|
|Either:P(A) + P(B) - 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|
Jun 12, 2011
You are correct. Updated.
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or do you intend it to be static?