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Kotlin Design Patterns and Best Practices

Prototype Design Pattern

Explore the Prototype design pattern in Kotlin, understanding how to create similar objects with slight variations without repetitive code changes. This lesson helps you learn about object cloning, data class copy methods, and how to handle changes effectively in user management scenarios, improving code flexibility and maintainability.

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The Prototype design pattern is all about customization and creating objects that are similar but slightly different. To understand it better, let’s look at an example.

Imagine we have a system that manages users and their permissions. A data class representing a user might look like this:

data class User(
    val name: String,
    val role: Role,
    val permissions: Set<String>,
){
fun hasPermission(permission: String) = permission in
      permissions
}
A data class representing a user

Each user must have a role, and each role has a set of permissions. We’ll describe a role as an enum class:

enum class Role {
    ADMIN,
    SUPER_ADMIN,
    REGULAR_USER
}
Describing a role as an enum class

The enum classes are a way to represent a collection of constants. This is more convenient than representing a role as a ...