One of the most commonly used structural patterns is the Adapter pattern. Like in real life, where you have plug adapters and bolt adapters, in Go, an adapter will allow us to use something that wasn't built for a specific task at the beginning.
The Adapter pattern is very useful when, for example, an interface gets outdated and it's not possible to replace it easily or fast. Instead, you create a new interface to deal with the current needs of your application, which, under the hood, uses implementations of the old interface.
Adapter also helps us to maintain the open/closed principle in our apps, making them more predictable too. They also allow us to write code which uses some base that we can't modify.