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Tdd performance kata

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Tdd performance kata Presentation Transcript

Live TDD Demo Arithmetic Expression Evaluator Ionut G. Stan & Andrei Savu
Mindset change Think about the smallest feature that you want to implement and express it in test code. Implement it. This leads to emergent design.
Problem 1 + 2 * 5 - 4 = ? Tools Python, unittest, TextMate Data Flow Expression > Split in tokens > Postfix notation > Evaluate 1+2*5-4 > (1, +, 2, *, 5, -, 4) > (1, 2, 5, *, +, 4, -) > 7
Postfix Notation !? 1 + 2 > 1 2 + 1 + 2 - 3 > 1 2 + 3 - 1 + 2 * 3 > 1 2 3 * + 1 + 2 * 3 - 4 > 1 2 3 * + 4 -
Conclusions TDD is no silver bullet
Questions? thanks :)