Diamond Kata Workshop

Done @ ncraft 2015, Paris

Transcript

1. Diamond Kata Bruno Boucard Jean-Laurent de Morlhon @brunoboucard @morlhon learn.tocraft.fr
2. learn.tocraft.fr learn.tocraft.fr
3. Kata
4. Kata Given  a  letter,  print  a  diamond  starting  with  ‘A’  with   the  supplied  letter  at  the  widest  point.   For  example:  print-­‐diamond  ‘C’  prints      A    B  B   C      C    B  B      A
5. Kata >  A   A   >  B    A   B  B    A >  D        A      B  B    C      C   D          D    C      C      B  B        A
6. Analysis
7. Analysis with dashes -­‐-­‐-­‐A   -­‐-­‐B-­‐B   -­‐C-­‐-­‐-­‐C   D-­‐-­‐-­‐-­‐-­‐D   -­‐C-­‐-­‐-­‐C   -­‐-­‐B-­‐B   -­‐-­‐-­‐A
8. Horizontal Symetry -­‐-­‐-­‐A   -­‐-­‐B-­‐B   -­‐C-­‐-­‐-­‐C   D-­‐-­‐-­‐-­‐-­‐D   -­‐C-­‐-­‐-­‐C   -­‐-­‐B-­‐B   -­‐-­‐-­‐A
9. Horizontal Symetry -­‐-­‐-­‐A   -­‐-­‐B-­‐B   -­‐C-­‐-­‐-­‐C   D-­‐-­‐-­‐-­‐-­‐D   -­‐C-­‐-­‐-­‐C   -­‐-­‐B-­‐B   -­‐-­‐-­‐A
10. Questions
11. Boucardian Analysis Line Pad left Length Pad Middle * Line 0  —-­‐A 3 4 n/a Line 1 —B-­‐B 2 5 1 Line 2 -­‐C—-­‐C 1 6 3 Line 3 D——-­‐D 0 7 5
12. Questions • What approaches did you follow : Brute Force / Recycling Tests / Small Increment tests / Boucardian like analysis ? • Does TDD allows you to delete a test ? • Did you write a test that was too hard to make it pass ? • How did you enhance visually the code to count the spaces ? • Does extracting methods/functions on such a small piece of code is really necessary ?
13. ?
14. Going further • http://claysnow.co.uk/recycling-tests-in-tdd/ • http://alistair.cockburn.us/Thinking+before +programming • http://natpryce.com/articles/000807.html • http://blog.gdinwiddie.com/2014/11/30/another- approach-to-the-diamond-kata/ • https://github.com/sandromancuso/diamond_kata/