Don’t Let the Command Design Pattern Confuse You in Kotlin: A Simple Guide with Practical Insights

The Command Design Pattern is a behavioral design pattern that encapsulates a request as an independent object, storing all necessary information to process the request. This pattern is especially beneficial in scenarios where you need to:

• Separate the initiator of the request (the sender) from the object responsible for executing it (the receiver).
• Implement functionality for undoing and redoing operations.
• Facilitate the queuing, logging, or scheduling of requests for execution.

Let’s embark on a journey to understand the Command design pattern, its purpose, and how we can implement it in Kotlin. Along the way, I’ll share practical examples and insights to solidify our understanding.

Command Design Pattern

At its core, the Command Design Pattern decouples the sender (the one making a request) from the receiver (the one handling the request). Instead of calling methods directly, the sender issues a command that encapsulates the details of the request. This way, the sender only knows about the command interface and not the specific implementation.

In short,

• Sender: Issues commands.