Exercises for the Mastering Kotlin Refactoring workshop

• Luhn Validation: Refactor an unnecessarily verbose collection pipeline, with hints from IntelliJ
• Gilded Rose: plenty of refactoring opportunities in an extended version of the Gilded Rose refactoring kata featured on Duncan's YouTube channel
• Conference Signup: refactor from mutable "bean" to algebraic data type and functions
• Cycle Race Leaderboard: refactoring Kotlin code & database schema, requiring multiple expand/contract deployments to apply the change without downtime
• Boat Maintenance Log: refactor serialised classes, requiring a strategy to cope with different versions of the data

Prerequisites

Before the workshop...

Install the following:

• IntelliJ
• Kotlin 1.9.2 or above
• JDK 17

To avoid disappointment on the day if there is limited wifi bandwidth, run the following command to download all the dependencies before the workshop:

./gradlew initDbs test