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A Command Pattern Example in Unity

A command pattern use case in Unity

A command is a reified method call.

— Robert Nystrom, Game Programming Patterns

Game Programming Patterns is an awesome book. I always keep it on my desk to occasionally use it as a manual.

Design Patterns are solutions to common problems in software engineering or design. Being “patterns”, they suggest a way to solve a known issue, which you can implement virtually in any language.

Some time ago I wrote about the Singleton Design Pattern, you can find it here:

Singleton Pattern Using Enum in Java

Among the many patterns described in the book, the Command Pattern was the one that struck me the most — it stuck in my mind, as it appeared as the solution to many problems I faced in game development and it was also the funniest to implement.

In the Command Pattern, a request or callback is encapsulated in an object, rendering it more object-oriented.

Think of user input in a game:

• if button1 is pressed do this
• else if button2 is pressed do that