What you'll learn in this Go packages & modules tutorial

This interactive Go tutorial has 12 hands-on exercises. Estimated time: 22 minutes.

1. What is a package — Every Go file starts with a `package` declaration. It tells Go which package this file belongs to.
2. Importing standard library packages — Go's standard library is huge. You do not install anything — it comes with Go.
3. The strings package — The `strings` package handles almost every text operation you will ever need.
4. The math package — The `math` package gives you mathematical constants and functions.
5. The time package — The `time` package handles dates, times, durations, and formatting.
6. The os package — The `os` package lets you interact with the operating system: environment variables, command-line arguments, file system…
7. Exported vs unexported — In Go, whether something is public or private is decided by a single rule:
8. What is a module — A module is a collection of Go packages with a shared identity and version.
9. Using a third-party package — Beyond the standard library, Go's ecosystem has thousands of packages at `pkg.go.dev`.
10. Import aliases — You can give an imported package a different name using an alias:
11. Blank import — Sometimes you import a package purely for its side effects — it registers something when it loads, but you never call it…
12. Build a string toolkit — No starter code.

Go Packages & Modules concepts covered

• You are not alone