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Transcript

  • 1. Live TDD Demo Arithmetic Expression Evaluator Ionut G. Stan & Andrei Savu
  • 2. 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.
  • 3. 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
  • 4. 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 -
  • 5. Conclusions TDD is no silver bullet
  • 6. Questions? thanks :)