Question 1

How to start refactoring the Gilded Rose kata?

Accepted Answer

First, clone the repository and run the build script to ensure tests pass. Then, write unit tests for the existing behavior before gradually cleaning up the UpdateQuality method, focusing on small, incremental changes to avoid breaking functionality.

Question 2

What are the business rules for Gilded Rose items?

Accepted Answer

Items have SellIn and Quality values that change daily: normal items degrade, Aged Brie improves, Sulfuras stays constant, Backstage passes increase near sell-by date then drop to zero, and Conjured items degrade twice as fast, with Quality capped between 0 and 50 (except Sulfuras at 80).

Question 3

Gilded Rose kata solution in Java or other languages?

Accepted Answer

While the original is in C#, many community ports exist for languages like Java, Python, and JavaScript. Search for 'Gilded Rose refactoring kata [language]' on GitHub to find implementations and compare different refactoring approaches.

Question 4

Gilded Rose vs other refactoring katas like String Calculator?

Accepted Answer

Gilded Rose focuses on complex conditional logic and legacy code constraints with multiple item types, while String Calculator is simpler, emphasizing incremental TDD for basic string parsing. Gilded Rose is better for practicing large-scale refactoring in a realistic scenario.

Question 5

How to add Conjured items in Gilded Rose?

Accepted Answer

Extend the UpdateQuality method to handle a new 'Conjured' item type that degrades Quality twice as fast as normal items. Ensure your refactoring maintains all existing rules, and write tests to verify the new behavior doesn't break other item types.

Question 6

Best practices for refactoring Gilded Rose?

Accepted Answer

Use test-driven development: write comprehensive tests first, then apply refactoring techniques like extracting methods, reducing conditionals, and introducing polymorphism. Keep changes small and frequent, and leverage version control to track progress.

Gilded Rose Original - C#

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