Programming Kata is a practice to improve your programming skills through something called "deep practice"

1. programming
Katas

2. “If
I would
have
had
time...”

3. “You
will never
have
time!
”

4. you can
be faster

6. Practice
makes YOU
better...

7. deep
Practice
makes YOU...

8. perfect

9. Should be
challenging
the kaizen
way

10. Should be
REpeated
many times

11. Should receive
feedback
(be the best,
be the worst)

12. perfect

13. Kata
String
calculator
Original kata by Roy Osherove from http://osherove.com/tdd-kata-1

14. 1. Create a simple String calculator with
a method Add(string numbers).
• can take an unknown amount of
numbers separated by a comma, and will
return their sum
• for an empty string it will return 0
• for “1” it will return 1
• for “1,2” it will return 3
• for “5,7,10,3” it will return 25
Original kata by Roy Osherove from http://osherove.com/tdd-kata-1

15. 2. Allow the Add method to handle new
lines between numbers (instead of
commas).
• for “1n2,3” it will return 6
• make sure you only test for correct
inputs. There is no need to test for
invalid inputs for these katas
Original kata by Roy Osherove from http://osherove.com/tdd-kata-1

16. 3. Allow the Add method to handle a
different delimiter.
• the beginning of the string can contain
a separate line that looks like this
“//[delimiter]n[numbers…]”
• for “//;n1;2” it will return 3
• for “//;n1;2n3;1” it will return 7
Original kata by Roy Osherove from http://osherove.com/tdd-kata-1

17. 4. Delimiters can be of any length with
the following format “//[delimiter]n”.
• for “//***n1***2***3n2***2” it will
return 10
Original kata by Roy Osherove from http://osherove.com/tdd-kata-1

18. 5. Calling Add with a negative number
will throw an exception “negatives not
allowed” - and the negative that was
passed.
• if there are multiple negatives, show
all of them in the exception message
Original kata by Roy Osherove from http://osherove.com/tdd-kata-1

20. MORE
Katas
on
http://katas.softwarecraftsmanship.org/

21. Questions?