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: