Kotlin Design Patterns and Best Practices/

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Prototype Design Pattern

Prototype Design Pattern

Learn the Prototype pattern in Kotlin and how to create complex objects in multiple ways.

We'll cover the following...

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 ...