Craftsmanship Workshop: Coding Kata
- 1. CODING KATA WORKSHOP Seattle Software Craftsmanship Meetup 25May2017
- 2. TONIGHT’S MENU • Code Katas • Test-Driven Development • Pair Programming • Tonight’s Kata • Session 1 • Session 2 • Session 3
- 3. CODE KATAS
- 4. WHAT IS A KATA?
- 6. TONIGHT’S MENU • Code Katas • Test-Driven Development • Pair Programming • Tonight’s Kata • Session 1 • Session 2 • Session 3
- 8. THREE RULES OF TDD 1. You are not allowed to write any production code unless it is to make a failing unit test pass. 2. You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures. 3. You are not allowed to write any more production code than is sufficient to pass the one failing unit test. http://bit.ly/3RulesTDD
- 9. RED -> GREEN -> REFACTOR Create a unit test that fails Write production code that makes it pass Clean up the mess you just made
- 10. TRANSFORMATION PRIORITY PREMISE • ({}–>nil) no code at all->code that employs nil • (nil->constant) • (constant->constant+) a simple constant to a more complex constant • (constant->scalar) replacing a constant with a variable or an argument • (statement->statements) adding more unconditional statements. • (unconditional->if) splitting the execution path • (scalar->array) • (array->container) • (statement->recursion) • (if->while) • (expression->function) replacing an expression with a function or algorithm • (variable->assignment) replacing the value of a variable. “As the tests get more specific, the code gets more generic.” http://bit.ly/TPPremise
- 16. TESTS ARE CODE TOO
- 17. 4 RULES OF SIMPLE DESIGN http://bit.ly/4SimpleDesignRules Kent Beck / Martin Fowler / J.B. Rainsberger / Corey Haines Has no more code than necessary Minimizes duplication Communicates intent Passes all tests
- 18. TONIGHT’S MENU • Code Katas • Test-Driven Development • Pair Programming • Tonight’s Kata • Session 1 • Session 2 • Session 3
- 19. PAIR PROGRAMMING
- 20. PAIR PROGRAMMING IS NOT… Credit:Anthony Sciamanna http://bit.ly/pingpongpair
- 21. ROLES OF PAIR PROGRAMMING
- 22. TONIGHT’S MENU • Code Katas • Test-Driven Development • Pair Programming • Tonight’s Kata • Session 1 • Session 2 • Session 3
- 23. TONIGHT’S KATA
- 24. BUILDING A PIZZA Pizzas Small $9 Medium $15 Large $18 Toppings Cheese, Onions, Bell Pepper 10% of Pizza Price Pepperoni, Sausage, Ham 18% of Pizza Price Roasted Garlic, SundriedTomato 32% of Pizza Price Requirements Start a new pizza Add toppings to the pizza Get the current price of the pizza Get a description of the pizza: “Small pizza with pepperoni, sausage and cheese.” Credit: ShayneVacher
- 25. SESSION 1
- 26. SESSION 2
- 27. SESSION 3