Go Packages and Functions
The main focus of this chapter is Go packages, which are Go's way of organizing, delivering, and using code. The most common component of packages is functions, which are pretty flexible and powerful and are used for data processing and manipulation. Go also supports modules, which are packages with version numbers. This chapter will also explain the operation of
defer, which is used for cleaning up and releasing resources.
Regarding the visibility of package elements, Go follows a simple rule that states that functions, variables, data types, structure fields, and so forth that begin with an uppercase letter are public, whereas functions, variables, types, and so on that begin with a lowercase letter are private ...