Unit 4. Collections

Collections are just groups of things. You probably have a music collection. Each album has a collection of songs, and each song has a collection of musical notes. If you want to build a music player, you’ll be happy to know that programming languages have collections too.

In Go, you can use the primitive types covered in unit 2 to compose more interesting composite types. These composite types allow you to group values together, providing new ways to collect and access data.