Some global variables can be stored in a context so that they can be passed through a series of function calls. This is generally not good practice since globals are available in every point of the application, so using context to store and recall them is pointless and a waste of resources and performance. If your package has some globals, you can use the Singleton pattern we looked at in Chapter 12, Synchronization with sync and atomic, to allow access to them from any point of your package or application.